fix dropdown paths

app/assets/javascripts/boards/components/board_sidebar.js

@@ -58,9 +58,7 @@ gl.issueBoards.BoardSidebar = Vue.extend({
         this.list = this.detail.list;
 
         this.$nextTick(() => {
-          let issueUrl = this.$refs.assigneeDropdown.dataset.issueUpdate;
-          issueUrl = issueUrl.replace(':project_path', this.issue.project.path);
-          this.endpoint = issueUrl;
+          this.endpoint = this.$refs.assigneeDropdown.dataset.issueUpdate;
         });
       },
       deep: true

app/assets/javascripts/boards/models/issue.js

@@ -95,7 +95,7 @@ class ListIssue {
       data.issue.label_ids = [''];
     }
 
-    return Vue.http.patch(url, data);
+    return Vue.http.patch(url.replace(':project_path', this.project.path), data);
   }
 }
 

ee/app/helpers/ee/boards_helper.rb

@@ -38,7 +38,7 @@ module EE
     end
 
     def board_sidebar_user_data
-      super.merge(group_id: @group&.path)
+      super.merge(group_id: @group&.id)
     end
   end
 end