Bug 18305 - jquery.fixFloat.js breaks advanced MARC editor

Bug 18305 - jquery.fixFloat.js breaks advanced MARC editor

Remove use of ECMASCRIPT 2015 default parameter syntax in
jquery.fixFloat.js to be compatible
with a wider range of browser versions.

Test plan:
  1. Usa a not so modern browser, for example Chrome/Chromium < 49, any version of IE
  besides Edge, Opera, or Firefox < 15.0.
  2. Edit a bibliographic record in staff client and try switching to
  advanced MARC editor (check console, no errors should appear).

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>