sema: minor improvement for reserved Str method handling

Author: mertcandav

std/jule/sema/pattern.jule

@@ -45,7 +45,7 @@ impl FuncPattern {
 			len(f.Generics) != 0 ||
 			len(f.Params) != 1 ||
 			f.Params[0].Mutable ||
-			f.Params[0].IsSmartptr() {
+			!f.Params[0].IsRefptr() {
 			ret false
 		}