main/postmarketos-ui-plasma-mobile: clean up runtime deps (MR 2433)

plasma-nm-mobile is already a dep of plasma-phone-components
ofono is already a dep of plasma-phone-components
ofono-openrc already gets pulled in automatically through openrc and
ofono
networkmanager is already pulled in by plasma-nm-mobile
qt5-qtvirtualkeyboard has been replaced by maliit ages ago

[ci:skip-build] already built successfully in CI