gave scroll-canvas-dashboard 100% height in kiosk-mode, fixes #11010 (#11017)

public/sass/components/_view_states.scss

@@ -3,6 +3,9 @@
   .navbar {
     display: none;
   }
+  .scroll-canvas--dashboard {
+    height: 100%;
+  }
 }
 
 .playlist-active,