fix: create connection crash

Author: r1b2ns

BDKSwiftExampleWallet/Extensions/BDK+Extensions/Connection+Extensions.swift

@@ -3,13 +3,9 @@ import Foundation
 
 extension Connection {
     static func createConnection() throws -> Connection {
-        let documentsDirectoryURL = URL.documentsDirectory
+        let documentsDirectoryURL = URL.defaultWalletDirectory
         let walletDataDirectoryURL = documentsDirectoryURL.appendingPathComponent(URL.walletDirectoryName)
 
-        if FileManager.default.fileExists(atPath: walletDataDirectoryURL.path) {
-            try FileManager.default.removeItem(at: walletDataDirectoryURL)
-        }
-
         try FileManager.default.ensureDirectoryExists(at: walletDataDirectoryURL)
         try FileManager.default.removeOldFlatFileIfNeeded(at: documentsDirectoryURL)
         let connection = try Connection(path: URL.persistenceBackendPath)