Fix another missing mkdir

Author: LyesSaadi

gradience/presets_manager_window.py

@@ -343,6 +343,9 @@ def reload_pref_group(self):
                 buglog("file")
                 # keep compatiblity with old presets
                 if repo.name.endswith(".json"):
+                    if not os.path.isdir(os.path.join(PRESET_DIR, "user")):
+                        os.mkdir(os.path.join(PRESET_DIR, "user"))
+
                     os.rename(repo, os.path.join(
                         preset_directory, "user", repo.name))