Fix missed schema version check in WAR mode

The cfgInjector needs to be registered with the LifecycleManager
to ensure the SchemaVersionCheck is called on server startup.
Without it registered the check is skipped, allowing a server to
start against the wrong schema.

Change-Id: I758ba12a0d98fc8ed0ebcee3a5a8e9d9fd33b2c0

gerrit-war/src/main/java/com/google/gerrit/httpd/WebAppInitializer.java

@@ -115,6 +115,7 @@ public class WebAppInitializer extends GuiceServletContextListener {
 
       manager = new LifecycleManager();
       manager.add(dbInjector);
+      manager.add(cfgInjector);
       manager.add(sysInjector);
       manager.add(sshInjector);
       manager.add(webInjector);