Use XDG_CONFIG_HOME on Linux

On Linux, profiles.json will now be stored in a directory called
openffboard under $XDG_CONFIG_HOME unless there is already a
profiles.json in their install directory. In the case that
XDG_CONFIG_HOME is not set $HOME/.config be used in its place.

Author: srounce

profile_ui.py

@@ -188,7 +188,7 @@ def create_or_update_profile_file(self, create: bool = False) -> bool:
             self.log("Profile: profile file created")
 
             # Ensure the parent directory exists
-            os.makedirs(get_config_dir_path(), exist_ok=True)
+            os.makedirs(get_config_dir_path(self.__PROFILES_FILENAME), exist_ok=True)
 
         try:
             with open(self.__PROFILES_FILEPATH, "w", encoding="utf_8") as f: