The Application Url isn't checked in the setup wizard like it is in the settings screen, anything can be entered

[ikomhoog]

Describe the bug
I didn't have https:// added to my URL and there was nothing telling me it was wrong.
This caused my discord notifications to not work(I don't use any other notifications)

To Reproduce
Steps to reproduce the behavior:

1. Run a new install

2. Fill in a random string/invalid Url

3. Setup discord notifications

4. Try to get a notification on discord (other than the test notifications), it will give Bad Request errors.

5. Try to enter the same string/invalid Url from settings, and notice the popup saying it's invalid

6. Enter a correct application Url and you will get discord notifications correctly.

Expected behavior
I expected this field to also have the check so only valid Urls can be entered.

Screenshots

Logs (Logs directory where Ombi is located)

�[41m�[30mfail�[39m�[22m�[49m: Ombi.Api.Api[1000]
StatusCode: BadRequest, Reason: Bad Request, RequestUri: https://discordapp.com/api/webhooks/012345678901234567890123/XXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Desktop (please complete the following information):

• OS: docker linuxserver/ombi

Ombi Version (please complete the following information):

• Version 4.3.3
• Media Server Jellyfin
• Database Type: SQLite (the default)

[github-actions]

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