Fix missing space in PreferencesAction

Change-Id: I476ac60682d2f1d189e8970818aa03dba5c03813
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/PreferencesAction.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/PreferencesAction.java
index 669410a..52cec52 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/PreferencesAction.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/PreferencesAction.java
@@ -20,7 +20,7 @@
 import com.google.gwt.user.client.ui.PopupPanel;
 import com.google.gwt.user.client.ui.PopupPanel.PositionCallback;
 
-class PreferencesAction{
+class PreferencesAction {
   private final SideBySide2 view;
   private final DiffPreferences prefs;
   private PopupPanel popup;