Fix clock tab icon sizing.

<vector

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:name="ic_clock"

    android:width="240dp"

    android:width="24dp"

    android:viewportWidth="240"

    android:height="240dp"

    android:height="24dp"

    android:viewportHeight="240" >

    <group

        android:name="clock_frame"