Remove header from Klipper's qr code page if it's in the tray

Tobias Fellarequested to merge
work/tobias/qr-header into master

Remove header from Klipper's qr code page if it's in the tray

Move the copy action to the applet's header if possible. This polishes the look a bit.

Screenshots or screen recordings

Before After
image image

(no visual change if the applet is not in the tray)

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