Bug 1642524 - Fix the IDs in the preferences' calendar pane. r=darktrojan

calendar/lightning/content/messenger-overlay-preferences.inc.xhtml

@@ -24,7 +24,7 @@
 #include ../../base/content/preferences/views.inc.xhtml
 #include ../../base/content/preferences/general.inc.xhtml
 
-    <hbox id="chatPaneCategory"
+    <hbox id="calendarReminderCategory"
           class="subcategory"
           data-category="paneCalendar">
       <html:h1 data-l10n-id="calendar-title-reminder"></html:h1>
@@ -32,7 +32,7 @@
 
 #include ../../base/content/preferences/alarms.inc.xhtml
 
-    <hbox id="chatPaneCategory"
+    <hbox id="calendarCategoriesCategory"
           class="subcategory"
           data-category="paneCalendar">
       <html:h1 data-l10n-id="calendar-title-category"></html:h1>