COMP: SuperBuild.cmake - Clean code

Move variable WITH_COVERAGE, DOCUMENTATION_TARGET_IN_ALL and CTEST_USE_LAUNCHERS
into "ctk_cmake_boolean_args" list.

SuperBuild.cmake

@@ -166,6 +166,9 @@ ENDFUNCTION()
 SET(ctk_cmake_boolean_args
   BUILD_TESTING
   CTK_USE_KWSTYLE
+  WITH_COVERAGE
+  DOCUMENTATION_TARGET_IN_ALL
+  CTEST_USE_LAUNCHERS
   ${ctk_libs_bool_vars}
   ${ctk_plugins_bool_vars}
   ${ctk_applications_bool_vars}
@@ -193,10 +196,7 @@ ExternalProject_Add(${proj}
   CMAKE_ARGS
     ${ctk_superbuild_boolean_args}
     -DCTK_SUPERBUILD:BOOL=OFF
-    -DWITH_COVERAGE:BOOL=${WITH_COVERAGE}
-    -DDOCUMENTATION_TARGET_IN_ALL:BOOL=${DOCUMENTATION_TARGET_IN_ALL}
     -DDOCUMENTATION_ARCHIVES_OUTPUT_DIRECTORY:PATH=${DOCUMENTATION_ARCHIVES_OUTPUT_DIRECTORY}
-    -DCTEST_USE_LAUNCHERS:BOOL=${CTEST_USE_LAUNCHERS}
     -DCTK_SUPERBUILD_BINARY_DIR:PATH=${CTK_BINARY_DIR}
     -DCTK_CMAKE_ARCHIVE_OUTPUT_DIRECTORY:PATH=${CTK_CMAKE_ARCHIVE_OUTPUT_DIRECTORY}
     -DCTK_CMAKE_LIBRARY_OUTPUT_DIRECTORY:PATH=${CTK_CMAKE_LIBRARY_OUTPUT_DIRECTORY}