MDL-57321 theme_boost: Remove extra quotation mark

theme/boost/templates/core/action_menu_trigger.mustache

@@ -20,7 +20,7 @@
 <div class="dropdown">
     <a href="#" class="dropdown-toggle" id="action-menu-toggle-{{instance}}" title="{{title}}" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">{{{actiontext}}}{{{menutrigger}}}{{#icon}}{{> core/pix_icon}}{{/icon}}{{#rawicon}}{{{.}}}{{/rawicon}}{{#menutrigger}}<b class="caret"></b>{{/menutrigger}}</a>
     {{#secondary}}
-        <div class="dropdown-menu dropdown-menu-right {{classes}}"{{#attributes}} {{name}}="{{value}}"{{/attributes}}">
+        <div class="dropdown-menu dropdown-menu-right {{classes}}"{{#attributes}} {{name}}="{{value}}"{{/attributes}}>
             {{#items}}{{!
                 }}{{#actionmenulink}}<a href="{{url}}" class="dropdown-item {{classes}}"{{#attributes}} {{name}}={{#quote}}{{value}}{{/quote}}{{/attributes}} {{#showtext}}aria-labelledby="actionmenuaction-{{instance}}"{{/showtext}}>{{#icon}}{{>core/pix_icon}}{{/icon}}{{#showtext}}<span class="menu-action-text" id="actionmenuaction-{{instance}}">{{{text}}}</span>{{/showtext}}</a>{{/actionmenulink}}{{!
                 }}{{#actionmenufiller}}<div class="dropdown-divider"></div>{{/actionmenufiller}}{{!