PARK CITY, Utah, Jan. 24, 2000 -- Brace yourself, prime-time soap junkies -- it's looking like curtains for both "Beverly Hills, 90210" and "Party of Five." Trade paper reports today say Fox is preparing to ax the two long-running series after this season. As is the way in TV, money and ratings apparently teamed to doom the once-happening pair. Both Daily Variety and The Hollywood Reporter say Fox was unable to come to a deal with TV legend Aaron Spelling to buy at least 12 new episodes of his company's "90210" to air this summer. Reports say the network decided the money just wasn't worth it -- what with the formerly hot show a good six seasons beyond its sizzling hot status. ("90210" spinoff "Melrose Place" died last year.) There also was said to concern over whether the likes of Spelling's own daughter Tori would reup for an 11th season. And then there's the m