[2/3] Settings: Increasing ringtone volume

Base: https://gerrit.omnirom.org/#/c/4881/
Telephony: https://gerrit.omnirom.org/#/c/4887/

Change-Id: Ic3f72c5041859cc19c25a247808ac6479e598da1

Conflicts:
	res/values/custom_arrays.xml
	res/values/custom_strings.xml