patchgit-gui: fix browsers [Up To Parent] in sub-sub-directories.

>browser_path used to end with a slash, so the regexp matches the empty string
>and therefore removes nothing.
>
>Fix this.
>
>Signed-off-by: Bert Wesarg <bert.wesarg@googlemail.com>
>
>---
> git-gui/lib/browser.tcl |    2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
>diff --git a/git-gui/lib/browser.tcl b/git-gui/lib/browser.tcl
>index c241572..a8c6223 100644
>--- a/git-gui/lib/browser.tcl
>+++ b/git-gui/lib/browser.tcl
>@@ -121,7 +121,7 @@ method _parent {} {
> 		if {$browser_stack eq {}} {
> 			regsub {:.*$} $browser_path {:} browser_path
> 		} else {
>-			regsub {/[^/]+$} $browser_path {} browser_path
>+			regsub {/[^/]+/$} $browser_path {/} browser_path
> 		}
> 		set browser_status [mc "Loading %s..." $browser_path]
> 		_ls $this [lindex $parent 0] [lindex $parent 1]