Clicking "force remove source branch" label now toggles the checkbox again

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/views/shared/issuable/_form.html.haml

@@ -129,7 +129,7 @@
       .col-sm-10.col-sm-offset-2
         .checkbox
           = label_tag 'merge_request[force_remove_source_branch]' do
-            = hidden_field_tag 'merge_request[force_remove_source_branch]', '0'
+            = hidden_field_tag 'merge_request[force_remove_source_branch]', '0', id: nil
             = check_box_tag 'merge_request[force_remove_source_branch]', '1', @merge_request.force_remove_source_branch?
             Remove source branch when merge request is accepted.

changelogs/unreleased/fix-uncheckable-label-for-force_remove_source_branch.yml

+---
+title: Clicking "force remove source branch" label now toggles the checkbox again
+merge_request: 
+author: