ZLS should not assume how the completed code will be used

[Verafahn]

When I use a function via code completion, ZLS completes the parameter list as well. However, when I intend to pass the function itself to another function (rather than calling it), it still completes the parameter list.

Additionally, completion for struct literals adds an extra ; compared to other containers. This causes inconvenience when passing an anonymous type as a function argument. I consider this a bug, as other containers do not exhibit this behavior.