[2/2] Settings: Headset plug: Disable if music is active

PS8:
-added summary

PS9:
-added category already here

Change-Id: I61d78f76c45a38028a99a888546e550395090491
Merge pull request #13 from omnirom/android-4.4

[2/2] Settings: Headset plug: Disable if music is active