cleanup: trim trailing whitespace (#11136)

* cleanup: trim trailing whitespace

* update(`.editorconfig`)

---------

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>

packages/misskey-js/test/streaming.ts

@@ -131,7 +131,7 @@ describe('Streaming', () => {
 		main.on('meUpdated', payload => {
 			mainChannelReceived.push(payload);
 		});
-		
+
 		const ws = await server.connected;
 		expect(new URLSearchParams(new URL(ws.url).search).get('i')).toEqual('TOKEN');