Similar to what we did in status desktop under
d0a26a326e95a14a6a8a5634c0d30cd6dc648b54
- since Qt 5.xy, hover is not enabled by default for QQC2, so enable it
unconditionally as we are a desktop app anyway
- this fixes several hover effects being broken, mostly for builtin
components like MenuItem and some buttons (eg. the leftmost NavBar)
where we haven't enabled those with `hoverEnabled: true` explicitely