Use local tsserver by default

[Benoît]

Starting from v2.0.0, coc-tsserver will use the global tsserver by default, instead of the local one. It exposes a new configuration option tsserver.useLocalTsdk to restore the previous behavior. Unfortunately, this option only works when using a workspace configuration.

I'd like to keep using the local version and not having to commit a workspace configuration to the project I'm contributing to. Would it be possible to make the tsserver.useLocalTsdk option work from the global configuration?

Thank you for your hard work!