Remove unnecessary parenthesees in "No service" lock screen string.

                                          --> <skip />

    <!-- On the keyguard screen, it shows the carrier the phone is connected to.  This is displayed if the phone is not connected to a carrier.-->

    <string name="lockscreen_carrier_default">(No service)</string>

    <string name="lockscreen_carrier_default">No service.</string>

    <!-- Shown in the lock screen to tell the user that the screen is locked. -->

    <string name="lockscreen_screen_locked">Screen locked.</string>