Themes: Add categories to theme change intent.

The following categories are available:

org.cyanogenmod.intent.category.MODS_HOMESCREEN
org.cyanogenmod.intent.category.MODS_LOCKSCREEN
org.cyanogenmod.intent.category.MODS_ICONS
org.cyanogenmod.intent.category.MODS_FONTS
org.cyanogenmod.intent.category.MODS_BOOTANIM
org.cyanogenmod.intent.category.MODS_NOTIFICATIONS
org.cyanogenmod.intent.category.MODS_ALARMS
org.cyanogenmod.intent.category.MODS_RINGTONES
org.cyanogenmod.intent.category.MODS_OVERLAYS

Change-Id: Ic444278d1d712cb6207bb10574a471524a8fed41