Bug 19986: 'Server name' doesn't appear as required

Bug 19986: 'Server name' doesn't appear as required

Test plan:
[1.] Go to Admin -> z39.50/SRU servers
[2.] Make a new z39.50 server
[3.] Fill in the required field (hostname, port, database)
[4.] Save the server
[5.] Notice that the form does not submit, tells you that Sever name is
     required
[6.] Repeat steps 2 - 5 but this time make a new SRU server
[6.] Upload the patch and repeat steps 1 - 3 (make a new z39.50 server
     and a new SRRU server)
[7.] See that now 'Server name:' is red and on the right side of the box
     there is a required note
[8.] Save both servers and it should have created a new z39.50 server
and a new SRU server

Signed-off-by: Roch D'Amour <roch.damour@inlibro.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>