Bug 26986: Prevent Selenium's StaleElementReferenceException

Bug 26986: Prevent Selenium's StaleElementReferenceException

This is a follow-up bug for bug 26162

By finding the element before the click I hope to get the good element,
even if the page changed in the meanwhile.

Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 836d9a38727859f06902a7be6790592431fe812e)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>