[BUG] "Unsecuring" does not work

[rockaut]

Describe the bug
After securing the App with an master password the removing of the masterpassword is not possible anymore.

Steps To Reproduce

1. Secure the app with a password
2. Restart app to verify the password
3. Try to remove the password in setting

Expected behavior
Removing the password to start the app without it.

Environment:

• OS: Windows 11
• AeroFTP Version: 4.0.4

[axpnet]

This is fixed in v4.0.5.
Removing the master password could get stuck when the OS credential store rejected the write, because the app returned early and left the vault in protected mode with no way out. In v4.0.5 the removal always completes: if the system keyring is unavailable it falls back to a local key file protected by OS file permissions, so you can take the password off and start the app without it. Validated on Windows. Thanks for reporting.