git-gui: Pad the database statistics dialog window.

The stat frame was right on the edge of the window on Mac OS X,
making the frame's border blend in with the window border.  Not
exactly the effect I had in mind.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -2950,7 +2950,7 @@ proc do_stats {} {
 		label $w.stat.v_$name -text $value -anchor w -font font_ui
 		grid $w.stat.l_$name $w.stat.v_$name -sticky we -padx {0 5}
 	}
-	pack $w.stat
+	pack $w.stat -pady 10 -padx 10
 
 	bind $w <Visibility> "grab $w; focus $w"
 	bind $w <Key-Escape> [list destroy $w]