[Kst-plot/kst] 166082: Fix qt4 build.

[Barth Netterfield]

  Branch: refs/heads/master
  Home:   https://github.com/Kst-plot/kst
  Commit: 1660822692f8603891653d1293415041b3d5b88e
      https://github.com/Kst-plot/kst/commit/1660822692f8603891653d1293415041b3d5b88e
  Author: Barth Netterfield <netterfield at astro.utoronto.ca>
  Date:   2017-11-22 (Wed, 22 Nov 2017)

  Changed paths:
    M src/widgets/scalarselector.cpp

  Log Message:
  -----------
  Fix qt4 build.