[panel] Fix crash when using the main menu
Replacing gtk_button_released() with a button-release-event in commit 13b2f9cd causes crashes, because we probably need to pass an event as argument to the signal. But we don't have this. However, it turns out that we don't need that call at all: this was probably needed for the released signal in ButtonWidget, but on 2004-01-19, it got removed (commit 50855ce2). So the fix is to just remove this line.
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