fix(calendar): update orientation property change detection logic

Author: desig9stein

src/components/calendar/calendar.ts

@@ -199,7 +199,13 @@ export default class IgcCalendarComponent extends EventEmitterMixin<
    * is being shown.
    * @attr orientation
    */
-  @property({ reflect: true, attribute: 'orientation' })
+  @property({
+    reflect: true,
+    attribute: 'orientation',
+    hasChanged(newVal, oldVal) {
+      return oldVal === undefined || newVal !== 'horizontal';
+    },
+  })
   public orientation: ContentOrientation = 'horizontal';
 
   /**