[Bug] Incorrect link within the GitHub "App Request" issue template

[SeinopSys]

Describe the bug

In the GitHub issue template for opening a new app request the link to check previously requested apps is incorrect, leading people to believe an app has not been requested yet and filing for a request by mistake.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://github.com/IceWhaleTech/CasaOS/issues
2. Click on 'New issue'
3. Click on 'App Request'
4. Check the "requested" link in the quoted section above the input

Expected behavior

I would have expected to be taken to the issues page of this repository with all the app requests, but instead saw only 2 in the main repo at the linked page.

Screenshots