Bug 37371: Set overwrite mode to replace

In our case I think overwriteMode needs to be set to replace:

https://maskito.dev/core-concepts/overwrite-mode
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

koha-tmpl/intranet-tmpl/prog/en/includes/calendar.inc

@@ -97,11 +97,13 @@
                         dateMode: altinput_dateformat,
                         timeMode: 'HH:MM',
                         dateSeparator: delimiter,
+                        overwiteMode: 'replace',
                     });
                 } else {
                     maskitoOptions = maskitoDateOptionsGenerator({
                         mode: altinput_dateformat,
                         separator: delimiter,
+                        overwiteMode: 'replace',
                     });
                 }
             }