debug: fix issue with not passing outFiles

#14655

src/vs/workbench/parts/debug/common/debug.ts

@@ -302,6 +302,7 @@ export interface IExtHostConfig extends IEnvConfig {
 	port?: number;
 	sourceMaps?: boolean;
 	outDir?: string;
+	outFiles?: string;
 }
 
 export interface IConfig extends IEnvConfig {

src/vs/workbench/parts/debug/electron-browser/debugService.ts

@@ -770,7 +770,7 @@ export class DebugService implements debug.IDebugService {
 				request: 'attach',
 				port,
 				sourceMaps: configuration.sourceMaps,
-				outDir: configuration.outDir,
+				outFiles: configuration.outDir || configuration.outFiles,
 				debugServer: configuration.debugServer
 			})
 		);