(SXHkD)~playerctl controls instead of mpc based commands

playerctl is a bit more generic and makes it easier to script
interactions.

Scripts/.local/scripts/spotify_volume

@@ -5,5 +5,5 @@ then
     echo "$(mpc volume | tr -d 'volume: ' | tr -d '%')"
 elif [[ $# -eq 1 ]]
 then
-    mpc volume "$(echo $1 | tr -d '%')"
+    playerctl --player=spotify volume "$(echo $1 | tr -d '%')"
 fi