CodeWhisperer: On disconnect(4 hours expiry), region isn't saved leading to "invalid grant"

[colemvnio]

Describe the bug When being disconnected after 4 hours(annoying), I attempt to reconnect by double clicking on "start", but it redirects me to another region's SSO other than the one I initially configured it for.

To reproduce

1. Login to CodeWhisperer, with SSO, in another region than "us-east-1"(default one)
2. Wait 4 hours to be logged out
3. Attempt to login
4. Look at the URL, it will be us-east-1 instead of your specified region

Expected behavior To redirect on my proper SSO region initially configured.

Screenshots

Your Environment

• OS: Mac M1 Pro
• JetBrains product: Webstorm
• JetBrains product version: 2023.1
• AWS Toolkit version: 1.67-231
• SAM CLI version: N/A
• JVM/Python version: N/A

[rli]

dupe of #3662