fix iso8601 case

Author: snowystinger

packages/@internationalized/date/src/queries.ts

@@ -286,7 +286,7 @@ function getWeekStart(locale: string): number {
       } else {
         weekInfo = {firstDay: 0};
       }
-    } else if (locale.includes('u-ca-iso8601')) {
+    } else if (locale.includes('-ca-iso8601')) {
       weekInfo = {firstDay: 1};
     } else {
       weekInfo = {firstDay: region ? weekStartData[region] || 0 : 0};

packages/@internationalized/date/tests/queries.test.js

@@ -283,6 +283,8 @@ describe('queries', function () {
       expect(startOfWeek(new CalendarDate(2021, 8, 4), 'en-US-u-ca-iso8601-fw-tue')).toEqual(new CalendarDate(2021, 8, 3));
 
       // override applied if extension appears in the middle of other extensions
+      expect(startOfWeek(new CalendarDate(2021, 8, 4), 'en-US-u-nu-thai-ca-iso8601')).toEqual(new CalendarDate(2021, 8, 2));
+      expect(startOfWeek(new CalendarDate(2021, 8, 4), 'en-US-u-nu-thai-ca-iso8601-fw-tue')).toEqual(new CalendarDate(2021, 8, 3));
       expect(startOfWeek(new CalendarDate(2021, 8, 4), 'en-US-u-ca-iso8601-fw-tue-nu-thai')).toEqual(new CalendarDate(2021, 8, 3));
     });
   });