prevent unnecessary apply events when pressing the enter key

Author: Jeff Rooks

src/date-range-picker/SDateRangePicker.svelte

@@ -168,6 +168,10 @@
   }
 
   const apply = () => {
+    if (!canApply()) {
+      return
+    }
+
     dispatchEvent("apply", {
       startDate: tempStartDate,
       endDate: tempEndDate