BUG: In SuperBuild.cmake, remove extra variable (WITH_COVERAGE) from CTK-Configure step.

SuperBuild.cmake

@@ -325,7 +325,6 @@ ExternalProject_Add(${proj}
     -DCTK_SUPERBUILD:BOOL=OFF
     -DCTEST_USE_LAUNCHERS:BOOL=${CTEST_USE_LAUNCHERS}
     -DCTK_SUPERBUILD_BINARY_DIR:PATH=${CTK_BINARY_DIR}
-    -DWITH_COVERAGE:BOOL=${WITH_COVERAGE}
     -DCMAKE_INSTALL_PREFIX:PATH=${ep_install_dir}
     -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
     -DCTK_CXX_FLAGS:STRING=${CTK_CXX_FLAGS}