Fix message string for error 102.

This PR is for [bug 6187](https://bugs.alliedmods.net/show_bug.cgi?id=6187).

After further inspection, there seems to be an issue with the string associated for error 102:

```/*102*/  "cannot find %s %s\n",```

It expects 2 string parameters, but only one is ever passed in at all call sites.

I'm not sure if I did this correctly, but I edited the string and then ran scpack on the sc5.scp file.