MDL-85294 qbank: Align header, buttons and switch in "Edit categories".

question/bank/managecategories/templates/addcategory.mustache

@@ -31,10 +31,10 @@
         "courseid": "1234"
     }
 }}
-<div id="qbank_managecategories-addcategory" class="ps-3">
+<div id="qbank_managecategories-addcategory">
     <button type="submit" data-action="addeditcategory" data-actiontype="add"
             data-contextid="{{contextid}}"
-            data-cmid="{{cmid}}" data-courseid="{{courseid}}" class="btn btn-primary">
+            data-cmid="{{cmid}}" data-courseid="{{courseid}}" class="btn btn-primary me-3">
         {{# str}} addcategory, core_question {{/ str}}
     </button>
 </div>

question/bank/managecategories/templates/categories_header.mustache

@@ -37,7 +37,7 @@
     }
 }}
 <div>
-    <div class="ps-3">
+    <div>
         {{{helpstringhead}}}
     </div>
 </div>