debug: do not auto focus editor on session end

fixes #6088

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

@@ -703,7 +703,6 @@ export class DebugService implements debug.IDebugService {
 		}
 
 		this.partService.removeClass('debugging');
-		this.editorService.focusEditor();
 
 		this.model.clearThreads(true);
 		this.setFocusedStackFrameAndEvaluate(null).done(null, errors.onUnexpectedError);