Two minor tweaks on git-gui where textboxes weren't vertically centered with their labels and buttons

[Twiinz <twiinz@xxxxxxxxx>]

In git-gui after clicking either on 'Create New Repository' or 'Open
Existing Repository' the form elements aren't centered like they are
pretty much everywhere else in the app. At least when ran on a mac,
haven't checked on other platforms.

Using grid instead of pack seems to fix this.

Hope that helps, cheers,
/twiinz

Attachment: choose_repository.tcl.patch
Description: Binary data