Switched mobile button icons to ellipsis and angle

## What does this MR do?
Switches the mobile button icons

## What are the relevant issue numbers?
Closes #19170
Part of #19200

## Screenshots (if relevant)
![Screen_Shot_2016-06-27_at_9.08.28_AM](/uploads/7784489402e342e671d02b24d2ea0d64/Screen_Shot_2016-06-27_at_9.08.28_AM.png)

See merge request !4944
(cherry picked from commit abc6004f)