[rex-remind101/keyboard-animation-fix] Smooths out the animation transition

Smooths out the animation transitions between multiple different keyboards during quick position changes from `becomeFirstResponder` calls.

When `[view becomeFirstResponder]` is called quickly amongst multiple views with multiple keyboards, the form sheet controller will bounce indiscriminately from changes in position. This bit of code prevents that bounce from occurring and smooths out all keyboard transitions in general.