Dialer: Add styling to Location permission dialog

* Currently the "Allow" button is square - we need to add a radius
* Thankfully there is already a button style which we can use and
  where we just need to change the background appropriately
* Apply rounding to background as well
* Remove elevation

Change-Id: Ia1c438d93384acb739da5662d586d99e56ce8965
4 files changed