Checklist drag handle now at the left side (same place as for the checklist items)

- most people scroll with their right thumb, so it happens sometimes
  that they move whole checklists by accident.
- this fixes the problem, and also it looks more clean than a drag
  handle in the middle of the screen

client/components/cards/checklists.styl

@@ -44,8 +44,8 @@ textarea.js-add-checklist-item, textarea.js-edit-checklist-item
 
   span.fa.checklist-handle
     padding-right: 20px
-    padding-top: 6px
-    float: right
+    padding-top: 3px
+    float: left
 
 
 .js-confirm-checklist-delete