Update Constants.swift

Author: devcsomnicg

swift-sdk/Constants.swift

@@ -381,7 +381,6 @@ public enum IterableCustomActionName: String, CaseIterable {
 
 public typealias ITEActionBlock = (String?) -> Void
 public typealias ITBURLCallback = (URL?) -> Void
-public typealias OnCompletionHandler = (Bool) -> Void
 public typealias OnSuccessHandler = (_ data: [AnyHashable: Any]?) -> Void
 public typealias OnFailureHandler = (_ reason: String?, _ data: Data?) -> Void
 public typealias UrlHandler = (URL) -> Bool