Fix up audio effects dialog

- Entirely remove string referencing Snapdragon, as there's nothing
  Snapdragon specific in the audio effects
- Remove title of the switch, it only duplicates the dialog title
- Improve margins

Change-Id: I5d2da3b16dcf60ece9b5db36cf2fc65c4a23c275

Conflicts:
	res/values-da/cm_strings.xml
	res/values-el/cm_strings.xml
	res/values-hu/cm_strings.xml