Exclude .atlas file type from resource browser XML parsing attempt.

bin/Data/Scripts/Editor/EditorResourceBrowser.as

@@ -1235,7 +1235,7 @@ bool GetBinaryType(String path, StringHash &out fileType, bool useCache = false)
 bool GetXmlType(String path, StringHash &out fileType, bool useCache = false)
 {
     String extension = GetExtension(path);
-    if (extension == ".txt" || extension == ".json" || extension == ".icns")
+    if (extension == ".txt" || extension == ".json" || extension == ".icns" || extension == ".atlas")
         return false;
 
     String name;