git-gui: fix encoding in git-gui file browser

Assume git tree objects (i.e. output of git-ls-tree) are encoded in system
encoding, for display in the git-gui file browser.

Signed-off-by: Karsten Blees <blees@dcon.de>

git-gui/lib/browser.tcl

@@ -197,7 +197,7 @@ method _ls {tree_id {name {}}} {
 	$w conf -state disabled
 
 	set fd [git_read ls-tree -z $tree_id]
-	fconfigure $fd -blocking 0 -translation binary -encoding binary
+	fconfigure $fd -blocking 0 -translation binary
 	fileevent $fd readable [cb _read $fd]
 }