[Tab Groups] Remove bucket for tab groups.

Bug: 1071685
Change-Id: I1d948dc47b416a01e9a4fc88d167dc69fca42143
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429248Reviewed-by: Connie Wan <connily@chromium.org>
Commit-Queue: Charlene Yan <cyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810476}

chrome/browser/ui/views/tabs/tab_group_editor_bubble_view.cc

@@ -371,7 +371,7 @@ void TabGroupEditorBubbleView::ButtonListener::ButtonPressed(
           browser_, chrome::FeedbackSource::kFeedbackSourceDesktopTabGroups,
           std::string() /* description_template */,
           std::string() /* description_placeholder_text */,
-          std::string("DESKTOP_TAB_GROUPS") /* category_tag */,
+          std::string() /* category_tag */,
           std::string() /* extra_diagnostics */);
       break;
     }