enhance(frontend): ファイルアップロード処理のリファクタと設定の簡略化

packages/frontend/src/utility/upload.ts

@@ -34,7 +34,7 @@ export function uploadFile(
 	file: File,
 	folder?: string | Misskey.entities.DriveFolder | null,
 	name?: string,
-	keepOriginal: boolean = prefer.s.keepOriginalUploading,
+	keepOriginal = false,
 ): Promise<Misskey.entities.DriveFile> {
 	if ($i == null) throw new Error('Not logged in');