Ticket #1659: Darker color style

Some fixies for skin.

Signed-off-by: Slava Zanko <slavazanko@gmail.com>

misc/skins/gotar.ini

@@ -78,5 +78,5 @@
 	viewunderline=brightgreen;black
 
 [buttonbar]
-	hotkey=brightgreen;white
-	button=black;blue
+	hotkey=lightgray;black
+	button=white;blue