Avoid bogus json

Entries like `top_k=Inf` become `"top_k": null` in `jsonencode`. While Ollama
does not complain, those are not actually valid settings. Since the places
where we accept `Inf` already have that as a default, take the easy way out
and simply drop those parameters.

Author: ccreutzi

+llms/+internal/callOllamaChatAPI.m

@@ -88,7 +88,7 @@
 
 nvpOptions = keys(dict);
 for opt = nvpOptions.'
-    if isfield(nvp, opt)
+    if isfield(nvp, opt) && ~isempty(nvp.(opt)) && ~isequaln(nvp.(opt),Inf)
         options.(dict(opt)) = nvp.(opt);
     end
 end