Enable fileWorkspaceFolder variable for remote tasks

Fixes #112514

src/vs/workbench/api/node/extHostTask.ts

@@ -121,7 +121,7 @@ export class ExtHostTask extends ExtHostTaskBase {
 	private async getVariableResolver(workspaceFolders: vscode.WorkspaceFolder[]): Promise<ExtHostVariableResolverService> {
 		if (this._variableResolver === undefined) {
 			const configProvider = await this._configurationService.getConfigProvider();
-			this._variableResolver = new ExtHostVariableResolverService(workspaceFolders, this._editorService, configProvider, process.env as IProcessEnvironment);
+			this._variableResolver = new ExtHostVariableResolverService(workspaceFolders, this._editorService, configProvider, process.env as IProcessEnvironment, this.workspaceService);
 		}
 		return this._variableResolver;
 	}