Improve logging around failied keychain deletion.

Pods

@@ -1 +1 @@
-Subproject commit 675e4be7f1a7c35d447965143ca0cadef99a179e
+Subproject commit 4c3935aa74dfe52f047d664197bbf3f9d7b50c86

SignalServiceKit/src/Storage/KeychainStorage.swift

@@ -96,6 +96,7 @@ public class SSKDefaultKeychainStorage: NSObject, SSKKeychainStorage {
         if let error = error {
             // If deletion failed because the specified item could not be found in the keychain, consider it success.
             if error.code == errSecItemNotFound {
+                Logger.info("Keychain delete failed; item not found.")
                 return
             }
             throw KeychainStorageError.failure(description: "\(logTag) error removing data: \(error)")