Update smart reply/action sizes to follow mocks.

The smart suggestion mocks show buttons with rounded sides - with this
CL we update the button dimensions to make their sides rounded.
This CL also changes a couple other button dimensions to follow the
mocks.

Screenshots:
One-line buttons before this CL:
https://screenshot.googleplex.com/yzMXZ3Djrmy.png
One-line buttons after this CL:
https://screenshot.googleplex.com/3rBDmTXzkch.png

Two-line buttons after this CL:
https://screenshot.googleplex.com/s1HfEsyTFFU.png
Two-line buttons after this CL:
https://screenshot.googleplex.com/Z2bCLgXCJJu.png

Bug: 121186803
Test: build Android and check how smart suggestions look.

Change-Id: Idac328c4e5e108e4af99e1de16e4db2dcb404bd2