Fix capitalization of Face Unlock.

    <string name="unlock_set_unlock_none_summary">No security</string>

    <!-- Title for preference that guides the user through a weak biometric lock [CHAR LIMIT=22] -->

    <string name="unlock_set_unlock_biometric_weak_title">Face unlock</string>

    <string name="unlock_set_unlock_biometric_weak_title">Face Unlock</string>

    <!-- Summary for preference that disables unlock security [CHAR LIMIT=45]-->

    <string name="unlock_set_unlock_biometric_weak_summary">Low security, experimental</string>