do not watch settings file as it is being watched already.

src/vs/platform/configuration/common/configurationService.ts

@@ -29,7 +29,6 @@ export class ConfigurationService extends Disposable implements IConfigurationSe
 		fileService: IFileService
 	) {
 		super();
-		this._register(fileService.watch(settingsResource));
 		this.userConfiguration = this._register(new UserSettings(this.settingsResource, undefined, fileService));
 		this.configuration = new Configuration(new DefaultConfigurationModel(), new ConfigurationModel());