fix position buttons when editing comments

templates/comment.mustache

@@ -59,7 +59,7 @@
                 <form id="edit{{ uuid }}" class="edit-comment-form" style="display:none;">
                     <textarea id="editarea{{ uuid }}" placeholder="" cols="40" rows="3"></textarea>                  
                     <input id="commentSubmit" class="owner btn btn-primary mb-1" type="submit" value="{{# str }} editButton, pdfannotator {{/ str }}">
-                    <input id="commentCancel" class="owner btn btn-secondary" type="reset" value="{{# str }} cancelButton, pdfannotator {{/ str }}" >
+                    <input id="commentCancel" class="owner btn btn-secondary mb-1" type="reset" value="{{# str }} cancelButton, pdfannotator {{/ str }}" >
                 </form>
             
             </div>