fix(minimize): close the tooltip after opening a minimized app

[hammerlink]

Problem

When an applet is minimized, its tooltip remains visible after activating the minimized button.
After the applet button is clicked it gets removed and it is no longer capable of detecting mouse movements.

Solution

After the applet button is removed destroy the tooltip popup.

This PR needs the change of pop-os/libcosmic#1138
Fixes pop-os/cosmic-panel#458

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