Increase tolerance for test_adadelta (#69919)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/69698
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69919
Reviewed By: cpuhrsch
Differential Revision: D33286427
Pulled By: jbschlosser
fbshipit-source-id: a2ca90683c14b6669f9b1804881ac675ba925fc5