Fix typo

Change-Id: If0104ebab265a98982808fa5003a499deae542b6
Reviewed-on: https://gerrit.libreoffice.org/70908
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

forms/source/component/formcontrolfont.cxx

@@ -439,7 +439,7 @@ namespace frm
     {
         if (isFontAggregateProperty(nHandle))
         {
-            // need to fire a event for PROPERTY_ID_FONT too apparently, so:
+            // need to fire an event for PROPERTY_ID_FONT too apparently, so:
             FontDescriptor font(getFont());
 
             // first set new value on backup copy