Fix wrong icons shown in the path bar

Fixes #654.

assets/stylesheets/global/_icons.scss

@@ -23,7 +23,7 @@
 @media (-webkit-min-device-pixel-ratio: 1.5), (min-resolution: 144dpi) {
   %icon { background-image: image-url('icons@2x.png'); }
   %doc-icon { background-image: image-url('docs-1@2x.png'); }
-  %doc-icon-2 { background-image: image-url('docs-2@2x.png'); }
+  %doc-icon-2 { background-image: image-url('docs-2@2x.png') !important; }
 }
 
 %darkIconFix {