patch 8.2.1551: Vim9: error for argument type does not mention the number

Problem:    Vim9: error for argument type does not mention the number.
Solution:   Pass the argument number to where the error is given.

src/vim9script.c

@@ -580,7 +580,7 @@ check_script_var_type(typval_T *dest, typval_T *value, char_u *name)
 		semsg(_(e_readonlyvar), name);
 		return FAIL;
 	    }
-	    return check_typval_type(sv->sv_type, value);
+	    return check_typval_type(sv->sv_type, value, 0);
 	}
     }
     iemsg("check_script_var_type(): not found");