[FIX]tiki-slideshow.php: replace get_number_of_pages function by...
requested to merge bkinywa24/tiki:replace-get_number_of_pages-and-get_page-functions-in-tiki-slideshow.php-27.x into 27.x
- [FIX]tiki-slideshow.php: replace get_number_of_pages function by getNumberOfPages and get_page by getPage
See merge request !5045 (merged)
(cherry picked from commit 14d29347)