Bug 13416: Typo in marc21_leader.pl position 5 (record status)

Bug 13416: Typo in marc21_leader.pl position 5 (record status)

Instead of a space in the leader on this position, it should be an a.

Test plan:
1) Log in to staff client
2) Find a record in the catalog
3) Edit the record
4) Click the on builder popup icon.
5) View the page source
   -- the option is " " for the 'a- Increase in encoding level'
      entry. It really should be 'a'.
6) Apply patch.
7) Repeat steps 1-5
   -- the option should be 'a' this time.
8) Run koha qa test tools.
   -- Discovered it failed. Provided a patch to fix this.
      It does, however, solve the major problem of ' ' vs. 'a'.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as described.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>