MDL-84772 core_question: Fix qbank filters layout

Fix question bank filters layout after Bootstrap 5 upgrade.

question/bank/editquestion/templates/add_new_question.mustache

@@ -28,7 +28,7 @@
         ]
     }
 }}
-<div class="createnewquestion mb-1">
+<div class="createnewquestion">
     {{^canadd}}
         {{#str}} nopermissionadd, question{{/str}}
     {{/canadd}}

question/templates/question_bank_controls.mustache

@@ -27,6 +27,6 @@
         "controls": "<div><button class=\"btn btn-secondary\">Control 1</button><button class=\"btn btn-secondary\">Control 2</button></div>"
     }
 }}
-<div class="d-grid gap-2 d-md-flex justify-content-start mb-2">
+<div class="d-flex flex-wrap flex-column flex-md-row align-items-md-center gap-2 mb-2">
     {{{controls}}}
-</div>
+</div>