[Kst] [Kst-plot/kst] e8096a: Fix back button for image streams.

[Barth Netterfield]

  Branch: refs/heads/master
  Home:   https://github.com/Kst-plot/kst
  Commit: e8096a2185b02d0f500d18ed871ca0454e791ce2
      https://github.com/Kst-plot/kst/commit/e8096a2185b02d0f500d18ed871ca0454e791ce2
  Author: Barth Netterfield <netterfield at astro.utoronto.ca>
  Date:   2015-05-07 (Thu, 07 May 2015)

  Changed paths:
    M src/libkstapp/mainwindow.cpp

  Log Message:
  -----------
  Fix back button for image streams.