fixed config file related stuff, waiting for a fix

Author: huguesdevimeux

tests/testing_utils.py

@@ -40,7 +40,7 @@ def __init__(self, scene_object, module_tested, caching_needed=False):
         if caching_needed:
             config['text_dir'] = os.path.join(
                 self.path_tests_medias_cache, scene_object.__name__, 'Text')
-            config['tex_dir'] = os.path.join(
+            file_writer_config['tex_dir'] = os.path.join(
                 self.path_tests_medias_cache, scene_object.__name__, 'Tex')
 
         file_writer_config['skip_animations'] = True