Workaround for compiling with Xcode 16 beta

With the beta of Xcode 16 compilation fails by reporting the error “The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions.” regarding the line

https://github.com/JohanDegraeve/xdripswift/blob/fec1005899893ddf20e36675f3aad96547e8c99c/xdrip/BluetoothTransmitter/CGM/Libre/Utilities/LibreNFC.swift#L462

Simply replacing the final  `+  (error?.localizedDescription ?? "none”)` with `+ error.debugDescription` makes xDrip compilable again.

xdrip/BluetoothTransmitter/CGM/Libre/Utilities/LibreNFC.swift

@@ -459,7 +459,7 @@ class LibreNFC: NSObject, NFCTagReaderSessionDelegate {
 
                                     tag.customCommand(requestFlags: .highDataRate, customCommandCode: Int(cmd.code), customRequestParameters:  cmd.parameters) { response, error in
 
-                                        let debugInfo = "NFC: '" + subCmd.description + " command response " + response.count.description + " bytes : 0x" + response.toHexString() + ", error: " +  (error?.localizedDescription ?? "none")
+                                        let debugInfo = "NFC: '" + subCmd.description + " command response " + response.count.description + " bytes : 0x" + response.toHexString() + ", error: " + error.debugDescription
 
                                         xdrip.trace("%{public}@", log: self.log, category: ConstantsLog.categoryLibreNFC, type: .info, debugInfo)