fix: holiday message reminder

Minor grammatical change
diff --git a/erpnext/templates/emails/holiday_reminder.html b/erpnext/templates/emails/holiday_reminder.html
index e38d27b..bbef6be 100644
--- a/erpnext/templates/emails/holiday_reminder.html
+++ b/erpnext/templates/emails/holiday_reminder.html
@@ -11,6 +11,6 @@
         {% endfor %}
     </ol>
     {% else %}
-    <p>You don't have no upcoming holidays this {{ frequency }}.</p>
+    <p>You have no upcoming holidays this {{ frequency }}.</p>
     {% endif %}
 {% endif %}