Style mini editor font sizes on atom-text-editor host element

…instead of via the shadow DOM. We always honor the computed font
styles of the host element.

static/editor.less

@@ -88,12 +88,6 @@ atom-text-editor::shadow {
       }
     }
   }
-}
-
-atom-text-editor.mini::shadow {
-  font-size: @input-font-size;
-  line-height: @component-line-height;
-  max-height: @component-line-height + 2; // +2 for borders
 
   .placeholder-text {
     position: absolute;
@@ -101,6 +95,12 @@ atom-text-editor.mini::shadow {
   }
 }
 
+atom-text-editor.mini {
+  font-size: @input-font-size;
+  line-height: @component-line-height;
+  max-height: @component-line-height + 2; // +2 for borders
+}
+
 atom-text-editor::shadow {
   z-index: 0;
   font-family: Inconsolata, Monaco, Consolas, 'Courier New', Courier;