fix: Disabled dates function not being called in month-picker mode (fixes #1070)

Author: Jasenkoo

src/VueDatePicker/utils/date-utils.ts

@@ -416,6 +416,9 @@ export const isMonthDisabled = (
         const key = `${padZero(month + 1)}-${year}`;
         return disabledDates.size ? disabledDates.has(key) : false;
     }
+    if (typeof disabledDates === 'function') {
+        return disabledDates(resetDateTime(set(getDate(), { month, year }), true));
+    }
     return false;
 };