Fix QA issue about malformed desktop launcher.

 * QA Notice: This package installs one or more .desktop files that do not
 * pass validation.
 *
 * 	/usr/share/applications/deadbeef.desktop: error: action group "Desktop Action Next" exists, but there is no matching action "Next"
 * 	/usr/share/applications/deadbeef.desktop: error: action group "Desktop Action Prev" exists, but there is no matching action "Prev"
 * 	/usr/share/applications/deadbeef.desktop: error: action group "Desktop Action Stop" exists, but there is no matching action "Stop"
 * 	/usr/share/applications/deadbeef.desktop: error: file contains group "Desktop Action Toggle Pause", which has an invalid action identifier, only alphanumeric characters and '-' are allowed
 * 	/usr/share/applications/deadbeef.desktop: error: value "Play;Pause;Toggle Pause;Stop;Next;Prev;" for key "Actions" in group "Desktop Entry" contains invalid action identifier "Toggle Pause", only alphanumeric characters and '-' are allowed
 *

--- a/deadbeef.desktop.in
+++ b/deadbeef.desktop.in
@@ -14,7 +14,7 @@
 Icon=deadbeef
 Exec=deadbeef %F
 Terminal=false
-Actions=Play;Pause;Toggle Pause;Stop;Next;Prev;
+Actions=Play;Pause;Toggle-Pause;Stop;Next;Prev;
 MimeType=application/ogg;audio/x-vorbis+ogg;application/x-ogg;audio/mp3;audio/prs.sid;audio/x-flac;audio/mpeg;audio/x-mpeg;audio/x-mod;audio/x-it;audio/x-s3m;audio/x-xm;audio/x-mpegurl;audio/x-scpls;application/x-cue;
 Categories=Audio;AudioVideo;Player;GTK;
 Keywords=Sound;Music;Audio;Player;Musicplayer;MP3;
@@ -35,7 +35,7 @@
 Name[zh_TW]=暫停
 Exec=deadbeef --pause
 
-[Desktop Action Toggle Pause]
+[Desktop Action Toggle-Pause]
 Name=Toggle Pause
 Name[zh_CN]=播放/暂停
 Name[zh_TW]=播放/暫停