sema: fix compile issues of tests

Author: mertcandav

std/jule/sema/tags_test.jule

@@ -66,7 +66,7 @@ static tagTests = []tagTest([
 fn testTags(t: &testing::T) {
 	mut f := &Field{
 		Tag: &token::Token{
-			File: &token::Fileset{
+			File: &token::FileSet{
 				Path: "/jule/test",
 			},
 		},