a11y fix: read emergency numbers as digits, not numbers.

Instead of reading as one hundred and ten, it should read as one-one-o.

Also make the number override dialog text input box a little bigger

Fix: 175517632
Fix: 175514672
Test: robotests
Change-Id: I7e3e823792f885004868ede790fc414a3fa66f01

tests/robotests/src/com/android/settings/gestures/EmergencyGestureNumberOverridePreferenceControllerTest.java

@@ -90,7 +90,7 @@ public class EmergencyGestureNumberOverridePreferenceControllerTest {
 
         mController.updateState(preference);
 
-        assertThat(preference.getSummary()).isEqualTo(
+        assertThat(preference.getSummary().toString()).isEqualTo(
                 mContext.getString(R.string.emergency_gesture_call_for_help_summary, "123"));
     }