Fix mobile menu over app-content

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

core/css/mobile.scss

@@ -64,7 +64,7 @@
 			left: 0;
 			width: 44px;
 			height: 44px;
-			z-index: 149;
+			z-index: 1050; // above app-content
 			background-color: rgba(255, 255, 255, .7);
 			cursor: pointer;
 			opacity: .6;
@@ -82,7 +82,7 @@
 		left: 0;
 		width: 44px;
 		height: 44px;
-		z-index: 149;
+		z-index: 1050; // above app-content
 		cursor: pointer;
 		opacity: 0.6;
 	}