handle incorrect case sensitivity

[psifertex]

Right now there's a case-sensitive comparison somewhere in the plugin manager so it thinks a plugin has moved when it's merely a different case. Need to probably normalize them when using the name as a key:

https://github.com/Vector35/community-plugins/blob/master/generate_index.py#L229C13-L229C23

But might need other changes and don't have time to investigate now.