Fix loading default config file from FilterConfig

Change-Id: Icb9b79514cd458c4bd39be175ba62537be537a9f

gitiles-servlet/src/main/java/com/google/gitiles/GitilesConfig.java

diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/GitilesConfig.java b/gitiles-servlet/src/main/java/com/google/gitiles/GitilesConfig.java
index 3f6c35c..640f3ca 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/GitilesConfig.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/GitilesConfig.java
@@ -50,7 +50,7 @@
 
   public static Config loadDefault(FilterConfig filterConfig)
       throws IOException, ConfigInvalidException {
-    FileBasedConfig config = new FileBasedConfig(defaultFile(), FS.DETECTED);
+    FileBasedConfig config = new FileBasedConfig(defaultFile(filterConfig), FS.DETECTED);
     config.load();
     return config;
   }