Default omz theme conflicts with Starship prompt

[kifirkin]

It seems that when using https://github.com/izissise/xxh-plugin-prerun-starship and https://github.com/xxh/xxh-plugin-zsh-ohmyzsh at the same time, setting ZSH_THEME here https://github.com/xxh/xxh-plugin-zsh-ohmyzsh/blob/master/pluginrc.zsh#L10-L14 conflicts with starship and overwrites the promt.

Actualy I've just removed that lines and it worked, but I have no idea how to fix this properly...

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[anki-code]

Good catch. We need to check if ZSH_THEME already exists before setting the default. PR is welcome!