Move default profile creation in mod_loader.gd from `_ready()` to `_load_mods()`

[KANAjetzt]

Can be salvaged from

• refactor: ♻️ Changed disabled_mods setting to load metadata #394

Moved default profile creation in mod_loader.gd from _ready() to _load_mods().
This is required so mod configs can be loaded on the first run of the game.

https://github.com/KANAjetzt/godot-mod-loader/blob/cea915e276a59c7b8c89f4c103e7d3147fdbf879/addons/mod_loader/mod_loader.gd#L111-L121

The default user profile should be created before mod configs are loaded. Without a user profile, the configs cannot be saved.