Settings of ``LoggerUi`` can't be changed dynamically at runtime

[Vickerinox]

Expected Behaviour

Each call to LoggerUi::show should respect the parameters of the invoking object. Enabling there to be changes of the style and colors at runtime.

Actual Behaviour

Calls to LoggerUi::show are deffered to the LOGGER_UI static variable. Meaning every LoggerUi will use the style and colors of the object that invoked the first call to show.

Steps to reproduce

put egui_logger = "=0.7.0" into Cargo.toml, and create an app where the argument to eg. LoggerUi::warn_color can be changed. No matter the change, the logger ui will always look as it did when the logger was first shown at the start of the program.