Revert "Move RulesCache binding to PrologModule"

This reverts commit 445657266f.

Moving this binding breaks the unit tests, so lets just revert
that...

Change-Id: Ie49f8c87aba4152da6aa438c2f5f69a58286f65d

gerrit-server/src/main/java/com/google/gerrit/rules/PrologModule.java

@@ -19,7 +19,6 @@ import com.google.gerrit.server.config.FactoryModule;
 public class PrologModule extends FactoryModule {
   @Override
   protected void configure() {
-    bind(RulesCache.class);
     factory(PrologEnvironment.Factory.class);
   }
 }