remove accidentally added QRCodeHandler

deltachat-ios/Handler/QRCodeHandler.swift

@@ -1,9 +0,0 @@
-//
-//  QRCodeHandler.swift
-//  deltachat-ios
-//
-//  Created by Macci on 06.08.19.
-//  Copyright © 2019 Jonas Reinsch. All rights reserved.
-//
-
-import Foundation