KeyCue

Fixed an issue where KeyCue could show the wrong dungeon after joining a Mythic+ group.

In some cases, old or unrelated LFG applications could overwrite the currently remembered dungeon target, causing the addon frame to display a different dungeon than the one the group was actually running.

Changes:
- Prevented old LFG applications from overwriting the current dungeon target after joining a group.
- Improved target clearing when leaving groups or entering dungeons.
- Updated /keytp scan so it no longer changes the target while already in a group.
- Added safer handling for remembered dungeon targets.
- Added a manual dungeon override command for testing and troubleshooting.