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La Jolla to Have a Season: Doubts about whether there would be a 1990 season for the financially beleaguered La Jolla Playhouse have been erased, a spokeswoman announced Tuesday. The seven-year-old theater, which has been laboring under a $703,000 deficit that has accrued since 1986, needed to raise $500,000 by Dec. 31 to ensure the season and $500,000 more by June 31 to achieve financial stability. Fund-raising efforts yielded $560,000 in gifts and pledges by Dec. 31, the spokeswoman said.