Add icon for dashboard app store category

Signed-off-by: Julius Härtl <jus@bitgrid.net>

core/css/icons.scss

@@ -491,6 +491,10 @@ audio, canvas, embed, iframe, img, input, object, video {
 	@include icon-color('workflow', 'categories', $color-black, 1, true);
 }
 
+.icon-category-dashboard {
+	@include icon-color('dashboard', 'categories', $color-black, 1, true);
+}
+
 .icon-talk {
 	@include icon-color('app-dark', 'spreed', $color-black, 1);
 }

core/img/categories/dashboard.svg

@@ -0,0 +1 @@
+<svg width="16" height="16" version="1.1" xmlns="http://www.w3.org/2000/svg"><path d="m7.9062 1a7 7 0 0 0-6.9062 7 7 7 0 0 0 7 7 7 7 0 0 0 7-7 7 7 0 0 0-7-7 7 7 0 0 0-0.09375 0zm0.09375 2.6992a4.3 4.3 0 0 1 4.3008 4.3008 4.3 4.3 0 0 1-4.3008 4.3008 4.3 4.3 0 0 1-4.3008-4.3008 4.3 4.3 0 0 1 4.3008-4.3008z" fill="#000" stroke-dashoffset="10" stroke-linecap="round" stroke-linejoin="round" stroke-width=".5" style="paint-order:markers stroke fill"/></svg>