[Bug] Inoreader: Can't add more feed because credentials are invalid

[guerinoni]

Reproduce:

• Add one feed for inoreader
• a pop-up shows and say can't add feed

I tried to remove account and add again or just update credentials but no luck

https://github.com/Ranchero-Software/NetNewsWire/assets/41150432/58d3ade7-3dec-4cb3-803e-a16b4e4d1795

[guerinoni]

The issue is because I already have 150 feed, it is the maximum for free plan

Maybe we can have a better error msg and a counter on left bar, just to check how many feed we are following :)