Crystal structure of catena-poly[aqua-µ-1,4-benzenedicarboxylato-κ2O:O'-3,5-dimethyl-4-phenyl-1,2,4-triazole-κN-zinc(II)] monohydrate, Zn(H2O)(C8H4O4)(C10H11N3)·H2O, C18H17N3O6Zn