TextField bug: DELETE char not notifying listener

Quick fix.

When the DELETE key was pressed, it was returning before notifying the attached TextFieldListener that its respective TextField was changed.

If this is intended behavior (which I pray it isn't...), then we should at least be consistent and handle the BACKSPACE case the same as well.
Merge pull request #452 from SG57/patch-1

TextField bug: DELETE char not notifying listener