Updated styles that used the ::shadow selector which is depreciated

Author: morekitsch

styles/fountain.less

@@ -77,12 +77,12 @@ ul.outline-list > li.outline-li > ul.outline-ul {
   height: 100%;
 }
 
-atom-text-editor::shadow {
-  .fountain.scene {
+atom-text-editor.editor {
+  .syntax--fountain.syntax--scene {
     color: @text-color-info;
   }
 
-  .fountain.character {
+  .syntax--fountain.syntax--character {
     font-weight: bold;
   }
 }