LNURL request urls are not generated properly when the callback contains query string

[tkthundr]

Describe the problem/bug
lnurl urls are not properly generated when the callback has a query string in it.

if request.callbackUrl=https://lnpay.co/v1/user/wallet/waka_5wtZllyHmwYqMJY5zA6kEP6/lnurl-process?ott=yolo

zap-iOS/Lightning/LNURL/LNURL.swift

Line 122 in d1d53fa

let urlString = "\(request.callbackURL)?k1=\(request.ephemeralSecret)&pr=\(invoice)"

generates https://lnpay.co/v1/user/wallet/waka_5wtZllyHmwYqMJY5zA6kEP6/lnurl-process?ott=yolo?k1=123&pr=lnbc....

To Reproduce
Steps to reproduce the behavior:
try this lnurl withdraw request

LNURL1DP68GURN8GHJ7MRWWPSHJTNRDUHHVVF0WASKCMR9WSHHWCTTV90N2AM5TFKXC72GD4M4JU2DFFVN27JPXE4525PK9AKXUATJDSKHQUN0VDJHXUELDA68G0T4DYKHWDFRGLW

Expected behavior
The LNURL withdraw works properly

Actual behavior
withdraw fails

Screenshots/Links

Additional context