Desktop file prefers icon name to abs. path
Desktop file prefers icon name to abs. path

In this way, icon themes can override the icons:

`/usr/share/icons/[theme]/[size]/apps/nuvolaplayer3_[app_id].png`
e.g. `/usr/share/icons/[theme]/32/apps/nuvolaplayer3_google_play_music.png`

Issue: tiliado/nuvolaplayer#78

Signed-off-by: Jiří Janoušek <2a48236b6dcae98c8c0e90f4673742773ee17d91@gmail.com>

tiliado/nuvolaruntime,tiliado/nuvolaruntime,tiliado/nuvolaruntime,tiliado/nuvolaruntime