all: fix config change on refresh

Typo from last CL.

Change-Id: I067ed4432132d6e1c7bb9e55151adcb6602d662e
diff --git a/app/src/main/java/io/upspin/upspin/ListDir.java b/app/src/main/java/io/upspin/upspin/ListDir.java
index e453c6a..84e3f92 100644
--- a/app/src/main/java/io/upspin/upspin/ListDir.java
+++ b/app/src/main/java/io/upspin/upspin/ListDir.java
@@ -208,7 +208,7 @@
     private void refresh() {
         Log.i("Refresh", "Refreshing mobile client");
 
-        ClientConfig cfg = reloadPreferences();
+        clientConfig = reloadPreferences();
 
         // This does not do networking operations hence it is suitable for the main thread.
         try {