Fix UI library forcing latched variables

This caused issues when setting render variables

code/client/cl_ui.cpp

@@ -3679,7 +3679,7 @@ void CL_FillUIImports(void)
  uii.Cvar_GetString = CvarGetForUI;
  uii.Cvar_Reset = Cvar_Reset;
  uii.Cvar_Find = Cvar_FindVar;
- uii.Cvar_Set = Cvar_Set;
+ uii.Cvar_Set = UI_Cvar_Set;
  uii.File_PickFile = PickFile;
  uii.File_FreeFile = FS_FreeFile;
  uii.File_ListFiles = ListFilesForUI;