Tweaks to the voicemail TOS UI

• moved scrollbar to edge of screen
• changed divider to .5dp and added shadow
• change "DECLINE" to "NO THANKS" for verizon TOS (it already was that way for non-verizon)
• changed "ACCEPT" button to "TURN ON" text
• increased the bottom bar height
• made the google transcription text in the TOS bold
• add an image to the non-verizon TOS screen (just using test image for now)

i didn't add the 'Learn more' link, since its not ready yet.

verizon screen shot:
https://drive.google.com/open?id=0B9o_KvtLkcuIcVk0dHBtWmFfdjJWQVV3OEdVc0JXN01XZHQ4

non-verizon screen shot:
https://drive.google.com/open?id=0B9o_KvtLkcuIci1OMlVXTHVuMGYwMWZVTS01dGVwMUpLdmRr

Bug: 62375681
Test: manual and updated unit tests
PiperOrigin-RevId: 160006810
Change-Id: Id45a3a848bb219a70fddbb5a7ada29cd39e604a9