Fixed: Menu button on mobile views

src/UI/Content/icons.less

@@ -280,7 +280,6 @@
 //Navbar
 .icon-sonarr-navbar-collapsed {
   .fa-icon-content(@fa-var-bars);
-  background-color: #ffffff;
 }
 
 .icon-sonarr-navbar-series {

src/UI/Navbar/NavbarLayoutTemplate.hbs

@@ -2,11 +2,9 @@
 <div class="navbar navbar-nzbdrone" role="navigation">
     <div class="container-fluid">
         <div class="navbar-header">
-            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
+            <button type="button" class="navbar-toggle navbar-inverse" data-toggle="collapse" data-target=".navbar-collapse">
                 <span class="sr-only">Toggle navigation</span>
-                <span class="fa fa-bar"></span>
-                <span class="fa fa-bar"></span>
-                <span class="fa fa-bar"></span>
+                <span class="icon-sonarr-navbar-collapsed fa-lg"></span>
             </button>
             <a class="navbar-brand" href="{{UrlBase}}/">
                 <!--<img src="{{UrlBase}}/Content/Images/logo.png?v=2" alt="Sonarr">-->