Telephony: do not override preference text colors

Preference text colors were being overridden with local values.
        This allows them to use the frameworks-provided values
        again. The override was not present in kitkat, so I'm
        not sure why they added it in. This was causing text colors
        on disabled preferences to remain black (instead of becoming
        gray like disabled preferences should be).  This commit
        fixes the issue.

Change-Id: Ibc66a8055eb0593f784af641ce3f5eaa998d779b
2 files changed