Remove stray exclamation mark

This was causing a cmd shell to be opened on Windows for every call to `azureChat.generate`. Harmless, but annoying, and unplanned.

Author: ccreutzi

azureChat.m

@@ -264,7 +264,7 @@
             if ~isempty(this.SystemPrompt)
                 messagesStruct = horzcat(this.SystemPrompt, messagesStruct);
             end
-!
+
             if isfield(nvp,"StreamFun")
                 streamFun = nvp.StreamFun;
             else