Simplify logo layout in admin header

Having the logo inside a list of one item wasn't needed and its classes
conflicted with other elements with the `.menu` class.

app/assets/stylesheets/admin.scss

@@ -111,10 +111,6 @@ $table-header:   #ecf1f6;
     [class^="icon-"] {
       font-size: $base-font-size;
     }
-  }
-
-  .menu .menu-text {
-    padding: 0;
 
     h1 {
       margin-top: $line-height / 2;
@@ -128,14 +124,15 @@ $table-header:   #ecf1f6;
         color: inherit;
         text-transform: uppercase;
       }
-    }
 
-    a {
-      display: inline-block;
-      font-family: "Lato" !important;
-      font-size: rem-calc(24);
-      font-weight: lighter;
-      padding: 0;
+      a {
+        color: inherit;
+        display: inline-block;
+        font-family: "Lato" !important;
+        font-size: rem-calc(24);
+        font-weight: lighter;
+        line-height: 1;
+      }
     }
   }