recovery: Remove redirect_stdio() when calling ShowFile().

When calling ScreenRecoveryUI::ShowFile(), the only thing that gets
inadequately logged is the progress bar. Replace the call to
ScreenRecoveryUI::Print() with ScreenRecoveryUI::PrintOnScreenOnly() for
the progress bar, so we can avoid calling redirect_stdio().

Change-Id: I4d7c5d5b39bebe0d5880a99d7a72cee4f0b8f325