fix redirect after login

Dependencies

• [2] YJYBKPZ5 Hydra/33: 'Sign in' should return to the referring page
• [3] JLDUSNUO * Unify rendering of finished and scheduled builds.
• [4] S66BOMVU * Added authentication.
• [*] J5UVLXOK * Start of a basic Catalyst web interface.

Change contents

• replacement in src/lib/Hydra/Controller/Root.pm at line 42
  [3.56]→[2.0:59](∅→∅)
  − if(! $username && ! defined $c->flash->{afterLogin}) {
  [3.56]

  [2.59]
  + if($username eq "" && $password eq "" && ! defined $c->flash->{afterLogin}) {