Closing the external resources setup window prompts "DelphiLint will not be usable" even if all settings are correct

### Prerequisites

- [X] This bug is in DelphiLint, not SonarDelphi, SonarQube, or my Delphi code.
- [X] This bug has not already been reported.

### DelphiLint version

0.6.0

### SonarDelphi version

0.40.0

### SonarQube version

_No response_

### Issue description

When configuring paths to external resources using the "External Resources Setup", attempting to close the window by clicking X displays the following warning in all cases, even when all values are valid (as seen in the image):


This message is misleading as DelphiLint continues to function with no problems.

### Steps to reproduce

1. Open the DelphiLint settings (`DelphiLint > Settings...`).
2. Click "Set up external resources" to open the External Resources Setup.
3. Try to close the window by clicking the X in the title bar (NOT by clicking "Apply this configuration").

### Minimal Delphi code exhibiting the issue

_No response_