cleanup: trim trailing whitespace (#11136)

* cleanup: trim trailing whitespace

* update(`.editorconfig`)

---------

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

packages/backend/src/misc/json-schema.ts

@@ -131,7 +131,7 @@ type NullOrUndefined<p extends Schema, T> =
 	| T;
 
 // https://stackoverflow.com/questions/54938141/typescript-convert-union-to-intersection
-// Get intersection from union 
+// Get intersection from union
 type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends ((k: infer I) => void) ? I : never;
 type PartialIntersection<T> = Partial<UnionToIntersection<T>>;