Fix compiler warnings about missing switch cases

Add missing case statements to fix all the remaining compiler
warnings.

Change-Id: Ia804df28317d4291e1e9e9a42f1e62e60b02f5e2

gerrit-server/src/main/java/com/google/gerrit/server/account/CapabilityControl.java

@@ -159,6 +159,11 @@ public class CapabilityControl {
           case BATCH:
             batch = true;
             break;
+
+          case ALLOW:
+          case BLOCK:
+          case DENY:
+            break;
         }
       }
     }