Don’t put folder icon on templates ‘folder’

After showing this to a few people the consensus seems to be that
‘Templates’ isn’t itself a folder. Therefore it shouldn’t have a folder
icon.

This has the advantage of disambiguating between being in a folder:
> [screenshot]

…and being in a subfolder:
> [screenshot]

app/assets/images/folder-black.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="26" height="20" viewBox="0 0 26 20"><path d="M10.3 0H0v20h26V4H12l-1.5-4h-.2z" fill="#dee0e2"/><path d="M9.1 2l1 2.7.5 1.3H24v12H2V2h7.1m1.4-2H0v20h26V4H12l-1.5-4z" fill="#0b0c0c"/></svg>

app/assets/stylesheets/components/message.scss

@@ -121,12 +121,13 @@
   white-space: nowrap;
 
 
-  a:first-child,
-  &-folder {
+  a,
+  &-folder,
+  &-subfolder {
 
     display: inline-block;
     vertical-align: top;
-    padding: 5px 0 0 60px;
+    padding: 5px 0 0 0;
     background-repeat: no-repeat;
     background-size: 38px auto;
     background-position: 0 1px;
@@ -139,8 +140,9 @@
     display: inline-block;
     vertical-align: top;
 
-    &:first-child {
+    &.folder-heading-folder {
 
+      padding: 5px 0 0 60px;
       background-image: file-url('folder-blue.svg');
       max-width: 33%;
       overflow: hidden;
@@ -154,23 +156,6 @@
 
   }
 
-  &-folder {
-
-    padding-left: 0;
-
-    &:first-child {
-
-      background-image: file-url('folder-black.svg');
-      padding-left: $gutter * 2;
-
-      @include ie-lte(8) {
-        background-image: file-url('folder-black.png');
-      }
-
-    }
-
-  }
-
   &-separator {
 
     display: inline-block;