git-gui: Simplify printing of index info to update-index.

During unstaging we can simplify the way we perform the output by
combining our four puts into a single call.

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

git-gui.sh

@@ -1447,10 +1447,7 @@ proc write_update_indexinfo {fd pathList totalCnt batch msg after} {
 		set info [lindex $s 2]
 		if {$info eq {}} continue
 
-		puts -nonewline $fd $info
-		puts -nonewline $fd "\t"
-		puts -nonewline $fd $path
-		puts -nonewline $fd "\0"
+		puts -nonewline $fd "$info\t$path\0"
 		display_file $path $new
 	}