Adds "title" to the Command in code actions

This fixes issue with some clients (see for example this
[kak-lsp issue](https://github.com/kak-lsp/kak-lsp/issues/669))
expecting to find a non empty string there to display.

internal/adapter/lsp/server.go

@@ -428,6 +428,7 @@ func NewServer(opts ServerOpts) *Server {
 				Title: actionTitle,
 				Kind:  stringPtr(protocol.CodeActionKindRefactor),
 				Command: &protocol.Command{
+					Title:   actionTitle,
 					Command:   cmdNew,
 					Arguments: []interface{}{wd, jsonOpts},
 				},