cleanup: trim trailing whitespace (#11136)

* cleanup: trim trailing whitespace

* update(`.editorconfig`)

---------

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

packages/backend/src/core/FederatedInstanceService.ts

@@ -43,19 +43,19 @@ export class FederatedInstanceService implements OnApplicationShutdown {
 	@bindThis
 	public async fetch(host: string): Promise<Instance> {
 		host = this.utilityService.toPuny(host);
-	
+
 		const cached = await this.federatedInstanceCache.get(host);
 		if (cached) return cached;
-	
+
 		const index = await this.instancesRepository.findOneBy({ host });
-	
+
 		if (index == null) {
 			const i = await this.instancesRepository.insert({
 				id: this.idService.genId(),
 				host,
 				firstRetrievedAt: new Date(),
 			}).then(x => this.instancesRepository.findOneByOrFail(x.identifiers[0]));
-	
+
 			this.federatedInstanceCache.set(host, i);
 			return i;
 		} else {
@@ -74,7 +74,7 @@ export class FederatedInstanceService implements OnApplicationShutdown {
 			.then((response) => {
 				return response.raw[0];
 			});
-	
+
 		this.federatedInstanceCache.set(result.host, result);
 	}