Form buttons are missing in Automate Explorer

[h-kataria]

@martinpovolny can you please take a look, i have tried several different forms in Automate explorer, i don't see form buttons on any of them. Automate explorer is little bit different from other explorer screens as that does not use GTL views and paging controls so maybe the code that loads form buttons partials has to be handled differently in this case.
cc @karelhala

[h-kataria]

@skateman i think this is a JS issue, after some debugging i found out that form buttons are present in DOM but are not visible due to incorrect height calculation of main-content div. When i tired to modify height by hand in firebug console i was able to see the form buttons on screen, see before/after screenshots below

looks like height calculation needs to be adjusted here: https://github.com/ManageIQ/manageiq-ui-classic/blob/master/app/assets/javascripts/miq_application.js#L1542

before DOM changes

after DOM changes

[skateman]

This was introduced by @martinpovolny in #1467 when he pulled out the #form_buttons_div from the #paging_div, I'm finalizing the fix just now...