Update test/intl402/Temporal/PlainMonthDay/from/buddhist-month-codes.js

Co-authored-by: Philip Chimento <philip.chimento@gmail.com>

Author: jessealama

test/intl402/Temporal/PlainMonthDay/from/buddhist-month-codes.js

@@ -27,8 +27,7 @@ for (const { monthCode, daysInMonth } of TemporalHelpers.ISOMonths) {
     { calendar, monthCode, day: daysInMonth + 1 },
     { overflow: "constrain" }
   );
-  assert.sameValue(constrained.monthCode, monthCode, `${monthCode} should be preserved with constrain`);
-  assert.sameValue(constrained.day, daysInMonth, `day ${daysInMonth + 1} should be constrained to ${daysInMonth} for ${monthCode}`);
+  TemporalHelpers.assertPlainMonthDay(constrained, monthCode, daysInMonth, `day ${daysInMonth + 1} should be constrained to ${daysInMonth} for ${monthCode}`);
 
   // Test reject overflow
   assert.throws(RangeError, () => {