Bug 1826438 - Set the Show Find Events menuitem checked by default for new profiles. r=aleca

Differential Revision: https://phabricator.services.mozilla.com/D181673

--HG--
extra : amend_source : a3ef8cc258e912f6690b5de2bb1fc184488710df

calendar/base/content/calendar-tab-panels.inc.xhtml

@@ -643,6 +643,7 @@
   <menuitem id="findEventsButton"
             data-l10n-id="calendar-find-events-menu-option"
             type="checkbox"
+            checked="true"
             command="calendar_show_unifinder_command"/>
   <menuseparator id="separatorBeforeHideWeekends"/>
   <menuitem id="hideWeekendsButton"