add pointer finger to full clickable app icon area

Signed-off-by: Jan-Christoph Borchardt <hey@jancborchardt.net>

core/css/header.scss

@@ -457,6 +457,7 @@ nav {
 		vertical-align: top !important;
 		height: 20px;
 		padding: 12px;
+		cursor: pointer;
 
 		a {
 			opacity: 0.6;