With -vet-style, give suggestion of separating where clauses with a comma rather than '&&'

This improves the error messages

src/check_type.cpp

@@ -1166,7 +1166,7 @@ gb_internal void check_bit_field_type(CheckerContext *ctx, Type *bit_field_type,
 				}
 			}
 			if (all_ones && all_booleans) {
-				if (build_context.vet_flags & VetFlag_Style) {
+				if (ast_file_vet_style(ctx->file)) {
 					char const *msg = "This 'bit_field' is better expressed as a 'bit_set' since all of the fields are booleans, of 1-bit in size, and the backing type is an integer (-vet-style)";
 					error(node, msg);
 				} else {