Do-it-yourself micro-budget horror filmmakers have a license to be weird, but even by this standard, HOUSESITTERS is an odd duck. The plot—a pair of callow millennials (played by co-writers Jamie Jirak and Annie Watkins) take what looks to be a sweet housesitting gig only to find themselves pawns in a ritual enacted by an evil magician—looks standard enough. But I haven't mentioned the sitters' gay porn obsession, or the strains of weed named after Italian crime movies from the '70s,…