The Walt Disney Company referred to an obscure, unacclaimed 1944 film as a 'classic' prior to its home-video release Tuesday, once again treating the word as tinsel which may be draped arbitrarily upon any random object. 'No home-video library is complete without the timeless Disney classic Mairzy Doats,' a TV commercial for the reissue said. 'These four unforgettable animated vignettes, hosted by Mickey Rooney and Judy Garland, are now available for a new generation to treasureyou know, much like previous generations have done.' The 45-minute video joins such previous Disney 'classics' as Melody Time, Fun & Fancy Free, Make Mine Music, and Tarzan. 