Fix Regression - unable to rearrange tasks within a checklist - v8.11.

Thanks to xet7 !

Fixes #5973

client/components/cards/checklists.css

@@ -72,6 +72,10 @@ textarea.js-edit-checklist-item {
   padding-top: 3px;
   float: left;
 }
+.checklist-title span.fa.checklist-handle.fa-arrows::before {
+  content: "↕️" !important;
+  font-family: inherit !important;
+}
 #card-details-overlay {
   top: 0;
   bottom: -600px;
@@ -148,6 +152,10 @@ textarea.js-edit-checklist-item {
   padding-top: 2px;
   padding-right: 10px;
 }
+.checklist-item span.fa.checklistitem-handle.fa-arrows::before {
+  content: "↕️" !important;
+  font-family: inherit !important;
+}
 .js-delete-checklist-item,
 .js-convert-checklist-item-to-card {
   margin: 0 0 0.5em 1.33em;

client/components/cards/checklists.jade

@@ -69,6 +69,7 @@ template(name="addChecklistItemForm")
   .edit-controls.clearfix
     button.primary.confirm.js-submit-add-checklist-item-form(type="submit") {{_ 'save'}}
     a.js-close-inlined-form(title="{{_ 'close-add-checklist-item'}}")
+      | ❌
     if showNewlineBecomesNewChecklistItem
       .material-toggle-switch(title="{{_ 'newlineBecomesNewChecklistItem'}}")
         input.toggle-switch(type="checkbox" id="toggleNewlineBecomesNewChecklistItem")
@@ -91,6 +92,7 @@ template(name="editChecklistItemForm")
   .edit-controls.clearfix
     button.primary.confirm.js-submit-edit-checklist-item-form(type="submit") {{_ 'save'}}
     a.js-close-inlined-form(title="{{_ 'close-edit-checklist-item'}}")
+      | ❌
     span(title=createdAt) {{ moment createdAt }}
     if canModifyCard
       a.js-delete-checklist-item {{_ "delete"}}...