Bug 28134: Replace use of input type number in onboarding templates

Bug 28134: Replace use of input type number in onboarding templates

This patch changes the instances of input of type="number" to input
type="text" with attributes inputmode="numeric" and pattern="[0-9]*"

To test, apply the patch and run through the process of installing Koha.
When you reach onboarding step 2, "Create a patron category," check the
enrollment period -> "In months" field. The field should not accept any
input except numbers.

Continue onboarding until step 5, "Create a new circulation rule." On
this page, check that these fields accept only numbers:

 - Current checkouts allowed
 - Loan period
 - Renewals allowed
 - Renewals period
 - Holds allowed (total)
 - Holds allowed (daily)
 - Holds per record (count)

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>