MDL-47494 gapselect: Fix some more codechecker issues.

question/type/gapselect/backup/moodle2/backup_qtype_gapselect_plugin.class.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/backup/moodle2/restore_qtype_gapselect_plugin.class.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/edit_form_base.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/edit_gapselect_form.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/lang/en/qtype_gapselect.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/question.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/questionbase.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/questiontype.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/questiontypebase.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/renderer.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/rendererbase.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/simpletest/helper.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/simpletest/testquestion.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/simpletest/testquestiontype.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/simpletest/testwalkthrough.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify

question/type/gapselect/version.php

 <?php
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 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify