FOUC on views 'add' button during page load

[briancwald]

When the View page loads, the add button shows unstyled dropdown that flashes on the screen before it compiles it into a button.

Replicate:

• Visit a view page and see on DOM load.

[mortenson]

Fixed here: https://github.com/briancwald/material_admin/commit/0471643d33735f8984f70ce67654033ba5fac390#diff-f0df95b2073b9120598c111eb1a0c998R902