Cannot download any models on Ubuntu

[dimitrisTim]

The reason why this happens is that there is a % character at the end of the following json file:
I got: Error reading file ~/.cache/lm-studio/config-presets/config.map.json: SyntaxError: Unexpected end of JSON input

Because of the config, the user cannot download any models.

TEMP FIX: the user can remove the % character at the end of json file, after running the AppImage.

Please fix this, so that new users are not hindered from downloading models :)