Increase ems limit on button text to 10.
Increase ems limit on button text to 10.

Change-Id: I4a33ea90eb7590ea32bbb4772bffc89a4000c3f8
Fixes: 120497145
Test: Verify on SupportCarDemos

AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx