ENH: list_catalog filer should work on the description, too

[bsipocz]

E.g. the 2MASS catalogs don't have 2mass or even mass in their name, thus an empty result is returned.

In [4]: Irsa.list_catalogs(filter='2mass')
Out[4]: {}

In [5]: Irsa.list_catalogs(filter='mass')
Out[5]: {}

In [6]: Irsa.list_catalogs(filter='twomass')
Out[6]: {}

While having the full list there are indeed 2mass holdings:

In [7]: Irsa.list_catalogs()
Out[7]: 
{
...
 'prelim_p1bs_frm': "WISE Preliminary Release Single Exposure (L1b) Frame Metadata Table (<a href='/applications/Gator/superseded.html' target='doc'>Superseded</a>)",
 'fp_psc': '2MASS All-Sky Point Source Catalog (PSC)',
 'fp_xsc': '2MASS All-Sky Extended Source Catalog (XSC)',
 'lga_v2': '2MASS Large Galaxy Atlas',
 'fp_scan_dat': "2MASS All-Sky Survey Scan Info (<a href='/applications/Gator/GatorAid/irsa/scan.html' target='doc'>README</a>)",
 'fp_coadd_dat': '2MASS All-Sky Survey Atlas Image Info',
 'pt_src_rej': '2MASS Survey Point Source Reject Table',
 'wsdb_info': '2MASS Survey Merged Point Source Information Table',
 'ext_src_rej': '2MASS Survey Extended Source Reject Table',
 'ewsdbf_info': '2MASS Survey Merged Extended Source Information Table',
 'pscan_dat': '2MASS Survey Scan Info',
 'coadd_dat': '2MASS Survey Atlas Image Info',
 'cosmos2020c': 'COSMOS2020 Classic Catalog',
...