Disable CDS.

SignalServiceKit/src/Contacts/OWSContactDiscoveryOperation.swift

@@ -85,7 +85,9 @@ class LegacyContactDiscoveryBatchOperation: OWSOperation {
 
     // Called at most one time.
     override func didSucceed() {
-        if isCDSEnabled {
+        guard isCDSEnabled else {
+            return
+        }
         // Compare against new CDS service
         let modernCDSOperation = CDSOperation(recipientIdsToLookup: self.recipientIdsToLookup)
         let cdsFeedbackOperation = CDSFeedbackOperation(legacyRegisteredRecipientIds: self.registeredRecipientIds)
@@ -94,7 +96,6 @@ class LegacyContactDiscoveryBatchOperation: OWSOperation {
         let operations = modernCDSOperation.dependencies + [modernCDSOperation, cdsFeedbackOperation]
         CDSOperation.operationQueue.addOperations(operations, waitUntilFinished: false)
     }
-    }
 
     // MARK: Private Helpers