ncpflash -> immiscibleflash in CMakeLists.txt

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@7608 2fb0f335-1f38-0410-981e-8018bf24f1b0

test/material/immiscibleflash/CMakeLists.txt

 # build target for the simple twophase lens problem
-ADD_EXECUTABLE("test_immiscibleflash" test_ncpflash.cc)
+ADD_EXECUTABLE("test_immiscibleflash" test_immiscibleflash.cc)
 TARGET_LINK_LIBRARIES("test_immiscibleflash" ${DumuxLinkLibraries})
 
 # add required libraries and includes to the build flags