[patch] change gcjwebplugin description

[Lillian Angel]

I committed your patch.

Thanks,
Lillian

Matthias Klose wrote:
> The plugin name used for IcedTea is the same as the one from classpath, but
> shows up with the same name in the browser; could we rename it to better
> identify the jvm? Name suggested by Michael Koch, now GCJ stands for "Great Cool
> Java".
> 
>   Matthias
> 
>