Bring comment actions in line with Calypso

Currently the Android comment action bar is out of sync with Calypso:

![ios](https://user-images.githubusercontent.com/5558824/40140063-46265910-5928-11e8-8e35-1f7d65003b80.jpeg)

Lets make it match this:

<img width="410" alt="screen-shot-2018-04-16-at-11-48-11-am" src="https://user-images.githubusercontent.com/5558824/40140065-4830b426-5928-11e8-9ce7-6ffbfe7d7ab1.png">
