Fixes CTK configuration renaming ctkDICOM2 application test. Fixes #454

This commit fixes the following error:

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-- Configuring done
CMake Error at CMake/ctkMacroSimpleTest.cmake:31 (add_test):
  Error evaluating generator expression:

    $<TARGET_FILE:ctkDICOM>

  No target "ctkDICOM"
Call Stack (most recent call first):
  Applications/ctkDICOM2/Testing/Cpp/CMakeLists.txt:21 (SIMPLE_TEST)


-- Generating done
-- Build files have been written to: /home/jchris/Projects/CTK-build/CTK-build
make[2]: *** [CTK-prefix/src/CTK-stamp/CTK-configure] Error 1
make[1]: *** [CMakeFiles/CTK.dir/all] Error 2
make: *** [all] Error 2
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Merge branch '454-fix-configure-with-ctkdicom2'

* 454-fix-configure-with-ctkdicom2:
  Fixes CTK configuration renaming ctkDICOM2 application test. Fixes #454