Revert "TextField's input prompt is now disabled properly (#15144)"

This reverts commit 52236519d9d3ed0cd7de5ed52c6aa19c514e15d6.

Causes regression when updating style names in a text change listener (TextChangeListenerChangingNonTextProperties)

Change-Id: I50bdb674872b98f3b1495a1115e352bfa7f13e8c