Bug 15717: Installer: Step 3 has <br /> showing

Bug 15717: Installer: Step 3 has <br /> showing

The step to install optional/mandatory things is broken with
many <br />'s instead of line breaks.

TEST PLAN
---------
1) Back up database
2) Drop database
3) Create empty database
4) Run web installer
   -- Notice that step 3 has ugly <br />'s at the last
      part of step 3.
5) Apply patch
6) Repeat steps 2-4
   -- Notice the <br />'s are now nice line breaks.
   NOTE: No promises of perfect positioning!
7) Run koha qa test tools.

Joubu: I have no idea if this is still needed. TO TEST

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
https://bugs.koha-community.org/show_bug.cgi?id=13618

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>