ConfigManager: Do not default to the "gerrit" project

For people trying out the app on their own Gerrit server it is confusing
if they do not see any changes at first because of this default.

Change-Id: I67c4256e31931f1377dfe5f83bd1bb57f5826ff6
diff --git a/app/src/main/java/com/google/reviewit/app/ConfigManager.java b/app/src/main/java/com/google/reviewit/app/ConfigManager.java
index 3d5afba..f43896f 100644
--- a/app/src/main/java/com/google/reviewit/app/ConfigManager.java
+++ b/app/src/main/java/com/google/reviewit/app/ConfigManager.java
@@ -52,7 +52,7 @@
   private static final String KEY_LABEL = "LABEL";
 
   private static final Set<String> DEFAULT_SERVERS = Collections.emptySet();
-  private static final String DEFAULT_QUERY = "status:open project:gerrit";
+  private static final String DEFAULT_QUERY = "status:open";
   private static final String DEFAULT_LABEL = "reviewit";
 
   private final SharedPreferences prefs;