fix compatibility issue for new sciter

src/ui/header.css

@@ -19,6 +19,12 @@ header #screen {
   color: color(light-text);
 }
 
+@media platform == "OSX" {
+  header #screen {
+    line-height: 11px;
+  }
+}
+
 header #secure {
   position: absolute;
   left: -10px;
@@ -64,4 +70,4 @@ span#fullscreen.active {
 
 button:disabled {
   opacity: 0.3;
-}
+}