[Staging] Add external branch rons0/mixxx:trackmenu-left-close-submenu (PR mixxxdj#13602)

Author: cr7pt0gr4ph7

STAGING_MERGE_SCRIPT.sh

@@ -143,3 +143,4 @@ merge_branch ready-for-merge/trigger-repair-database
 merge_branch wip/soft-pitch-ramp
 merge_branch wip/metadata-push
 merge_branch ext/daschuer/gh13707-write-metadata-via-symlink # https://github.com/mixxxdj/mixxx/pull/13711
+merge_branch ext/ronso0/trackmenu-left-close-submenu # https://github.com/mixxxdj/mixxx/pull/13602