wear_ui: Remove Print()/ShowFile()/PutChar().

They're mostly identical to the ones in ScreenRecoveryUI, except for the
(legacy) use of 'text_top_'. Because wear_ui.cpp misses the change in
[1] that uses an alternate screen for viewing recovery logs.

Also clean up the included headers.

[1] commit c0491632 ('Add an alternate
screen for viewing recovery logs.').

Test: Build a wearable target recovery; `View recovery logs`.
Change-Id: Ic9208c42a11c037469f5b073ef7d9b721c14d1f3