Revert "Make sure tests can be run offline and by adding new cmake switch"

This reverts commit 6674334.

Author: Gianfranco Costamagna

tests/CMakeLists.txt

@@ -192,9 +192,6 @@ if (JSON_Install)
 endif()
 
 add_subdirectory(cmake_add_subdirectory)
-if (NOT JSON_No_Internet)
-    add_subdirectory(cmake_fetch_content)
-    add_subdirectory(cmake_fetch_content2)
-endif()
-
+add_subdirectory(cmake_fetch_content)
+add_subdirectory(cmake_fetch_content2)
 add_subdirectory(cmake_target_include_directories)