git-gui: Prefer Tk's entry widget over a 1 line text field.
git-gui: Prefer Tk's entry widget over a 1 line text field.

I'm a fool and previously used a text widget configured with a height
of 1 and special bindings to handle focus traversal rather than the
already built (and properly behaved) entry widget.

Signed-off-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>
destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git