Bug 27412: Update tools/overduerules.tt to adhere to ACC2

Bug 27412: Update tools/overduerules.tt to adhere to ACC2

This patch changes the 1 occurance of an input of type="number" to input type="text" inputmode="numeric" pattern="[0-9]*"
The "min" attribute has also been removed (Thanks Owen)

Test plan:
Open the file and ensure that no other inputs of type="number
were missed.

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