Remove OnlyShowIn=Unity from clementine.desktop's action sections (#5444)

dist/clementine.desktop

@@ -38,7 +38,6 @@ Actions=Play;Pause;Stop;StopAfterCurrent;Previous;Next;
 [Desktop Action Play]
 Name=Play
 Exec=clementine --play
-OnlyShowIn=Unity;
 Name[af]=Speel
 Name[be]=Прайграць
 Name[bg]=Възпроизвеждане
@@ -89,7 +88,6 @@ Name[zh_TW]=播放
 [Desktop Action Pause]
 Name=Pause
 Exec=clementine --pause
-OnlyShowIn=Unity;
 Name[be]=Прыпыніць
 Name[bg]=Пауза
 Name[br]=Ehan
@@ -135,7 +133,6 @@ Name[zh_TW]=暫停
 [Desktop Action Stop]
 Name=Stop
 Exec=clementine --stop
-OnlyShowIn=Unity;
 Name[be]=Спыніць
 Name[bg]=Спиране
 Name[br]=Paouez
@@ -184,7 +181,6 @@ Name[zh_TW]=停止
 [Desktop Action StopAfterCurrent]
 Name=Stop after this track
 Exec=clementine --stop-after-current
-OnlyShowIn=Unity;
 Name[be]=Спыніць пасьля гэтага трэку
 Name[bg]=Спри след тази песен
 Name[br]=Paouez goude ar roud-mañ
@@ -232,7 +228,6 @@ Name[zh_TW]=在這首歌之後停止
 [Desktop Action Previous]
 Name=Previous
 Exec=clementine --previous
-OnlyShowIn=Unity;
 Name[af]=Vorige
 Name[be]=Папярэдні
 Name[bg]=Предишна
@@ -280,7 +275,6 @@ Name[zh_TW]=往前
 [Desktop Action Next]
 Name=Next
 Exec=clementine --next
-OnlyShowIn=Unity;
 Name[af]=Volgende
 Name[be]=Далей
 Name[bg]=Следваща