applets/appmenu: fix keeping button always visible in compact mode
In compact mode, the button tries to disable itself rather than hiding when the active app doesn't support the global menu, but this gets undone by the widget setting itself to hidden when in that state.
We can minimally fix this by adding an extra condition to the status property code.
BUG: 435928 FIXED-IN: 6.0.3
(cherry picked from commit 3bfeffbd)