Fix typo in testname (#78258)
`test_linear2D_no_bias_backwarwd` -> `test_linear2D_no_bias_backward`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/78258
Approved by: https://github.com/kulinseth, https://github.com/janeyx99
(cherry picked from commit 705082656a9dd2c9f243da01f28a195b94b24d66)
