Removing Extra labels on LabelMap panoramas

[JeremyFreiburger]

Resolves #3564

Added method to clear labels extra labels when showing a new label pop up.

Before/After screenshots (if applicable)

Testing instructions

Things to check before submitting the PR

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• I've tested on mobile (only needed for validation page).

[misaugstad]

Perfect, thanks @JeremyFreiburger! 😁