Whitespace
Set more text field bits when swapping securedness.

Granted, you're almost certainly NOT going to ever swap a live
text field between secure and not (and if you are, you should
make sure you really mean it), but now it'll work.
Unused import
Teach JavaTPPlatform how to set window titles.

Since it owns the JFrame now, JavaPlatform.setTitle's
call into LWJGL's Display.setTitle does nothing.

Of course, it's really unfortunate that your existing
code just mysteriously breaks if you register with TPPlatform
& you need to update your calls, so I should REALLY do something
up in playn to let this hook in and make it all Just Work.
But not today.