Avoid retrying initialize request on InvalidParams

[radeksimko]

As discovered in hashicorp/terraform-ls#1041 vim-lsp resends initialize request when the server responds -32602 (InvalidParams) error code.

It is highly unlikely that any server would respond successfully on any following attempt when the parameters are wrong, so I would suggest that retries are not attempted on this particular error as it can also mask the original problem (as fixed in #1350).

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[radeksimko]

This is still a valid bug AFAICT