Don't ignore the parameter of MergeRequestsHelper#mr_change_branches_path

app/helpers/merge_requests_helper.rb

@@ -75,10 +75,10 @@ module MergeRequestsHelper
     new_namespace_project_merge_request_path(
       @project.namespace, @project,
       merge_request: {
-        source_project_id: @merge_request.source_project_id,
-        target_project_id: @merge_request.target_project_id,
-        source_branch: @merge_request.source_branch,
-        target_branch: @merge_request.target_branch,
+        source_project_id: merge_request.source_project_id,
+        target_project_id: merge_request.target_project_id,
+        source_branch: merge_request.source_branch,
+        target_branch: merge_request.target_branch,
       },
       change_branches: true
     )