MDL-49587 plugin: Stop silencing include errors

Stop silencing errors when including version.php

lib/classes/component.php

@@ -1101,7 +1101,7 @@ $cache = '.var_export($cache, true).';
                 $plugin = new stdClass();
                 $plugin->version = null;
                 $module = $plugin;
-                @include($fullplug.'/version.php');
+                include($fullplug.'/version.php');
                 $versions[$type.'_'.$plug] = $plugin->version;
             }
         }

lib/classes/plugin_manager.php

@@ -291,7 +291,7 @@ class core_plugin_manager {
                 $plugin = new stdClass();
                 $plugin->version = null;
                 $module = $plugin;
-                @include($fullplug.'/version.php');
+                include($fullplug.'/version.php');
                 $this->presentplugins[$type][$plug] = $plugin;
             }
         }