Fix filename typo in hacs.json

[bartfailt]

[Flying-Tom]

This typo makes HACS unable to download and throw out "Unknown error"

[EboBH83]

+1

[wuwentao]

@Flying-Tom @EboBH83 @bartfailt

as current repo is not active more than 6 months. I have forked it and consider to maintain it in futuer. https://github.com/wuwentao/midea_ac_lan

PR is welcome

Thanks