Made the file dialogs modal.

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/src/browser/dialogs/settings/settings-component.tsx

@@ -502,6 +502,7 @@ export class SettingsComponent extends React.Component<
       canSelectFiles: false,
       canSelectMany: false,
       canSelectFolders: true,
+      modal: true,
     });
     if (uri) {
       const sketchbookPath = await this.props.fileService.fsPath(uri);