Parameter lost with startgroup link.

[hanssiemons]

Checklist

• [ x] I am reporting an issue in existing functionality that does not work as intended
• [ x] I've searched for existing GitHub issues

Description

If you open a botlink with startgroup parameter, it will add the bot to a group, but the parameter is lost. This is since the screen where you can select admin rights for the bot.

Expected Behavior

It should add the bot to the group, and pass the parameter.

Actual Behavior

The bot is added without passing the parameter.

Steps to Reproduce

https://telegram.me/thisismyfantastic_bot?startgroup=parameter

Environment

Device: iPhone

iOS version: 16.0

App version: 9.0

Please note that the parameter is also lost in the official Android app.