Change color of Safari pinned tab favicon (#746)

index.html

@@ -35,7 +35,7 @@
     <link rel="apple-touch-icon" sizes="180x180" href="img/favicon/apple-touch-icon.png?v=[[VERSION]]">
     <link rel="icon" type="image/png" sizes="32x32" href="img/favicon/favicon-32x32.png?v=[[VERSION]]">
     <link rel="icon" type="image/png" sizes="16x16" href="img/favicon/favicon-16x16.png?v=[[VERSION]]">
-    <link rel="mask-icon" href="img/favicon/safari-pinned-tab.svg?v=[[VERSION]]" color="#5bbad5">
+    <link rel="mask-icon" href="img/favicon/safari-pinned-tab.svg?v=[[VERSION]]" color="#333333">
     <link rel="shortcut icon" href="img/favicon/favicon.ico?v=[[VERSION]]">
     <meta name="msapplication-TileColor" content="#313131">
     <meta name="msapplication-config" content="browserconfig.xml?v=[[VERSION]]">