Changed the output of listmodules.

If it's ok like this please merge, otherwise let me know.

opencog> listmodules
Filename: libAtomSpaceExtensions.so, ID: opencog::QueryModule
Filename: libPythonModule.so, ID: opencog::PythonModule
Filename: libattention.so, ID: opencog::AttentionModule
Filename: libbuiltinreqs.so, ID: opencog::BuiltinRequestsModule
Filename: libdimensionalembedding.so, ID: opencog::DimEmbedModule
Filename: libnlp-types.so, ID: opencog::NLPTypesModule
Filename: libocweb.so, ID: opencog::WebModule
Filename: libpersist.so, ID: opencog::PersistModule
Filename: libquery.so, ID: opencog::QueryModule
Filename: libscheme-shell.so, ID: opencog::SchemeShellModule
Filename: libubigraph.so, ID: opencog::UbigraphModule