Fix CMake failing to generate the bindings.

A new parameter was added to the binding_generator python file,
but the CMake file was not adjusted.

CMakeLists.txt

@@ -132,7 +132,7 @@ endif()
 
 # Generate source from the bindings file
 message(STATUS "Generating Bindings")
-execute_process(COMMAND "python" "-c" "import binding_generator; binding_generator.generate_bindings(\"${GODOT_CUSTOM_API_FILE}\")"
+execute_process(COMMAND "python" "-c" "import binding_generator; binding_generator.generate_bindings(\"${GODOT_CUSTOM_API_FILE}\", True)"
 	WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
 	RESULT_VARIABLE GENERATION_RESULT
 	OUTPUT_VARIABLE GENERATION_OUTPUT)