Revert "WIP: deactivate DICOM tests"

This reverts commit 034e4adebd1f71663851d22c862f3e2b7c33f4bb.

This was only a workaround to continue working, should be fixed in master

Applications/ctkDICOM/Testing/CMakeLists.txt

@@ -1 +1 @@
-# ADD_SUBDIRECTORY(Cpp)
+ADD_SUBDIRECTORY(Cpp)

Applications/ctkDICOM/Testing/Cpp/CMakeLists.txt

@@ -27,5 +27,4 @@ ENDMACRO( SIMPLE_TEST  )
 #
 # Add Tests
 #
-
-# SIMPLE_TEST(ctkDICOMTest1)
+SIMPLE_TEST(ctkDICOMTest1)