Remove duplicated test block

[detrout]

For some reason the full body of
elpy-black-fix-code-should-do-nothing-if-already-formatted was duplicated identically and the github test runner action is generating a stack trace for the error.

If you look directly above the deleted code you'll see an identical copy of the conditional code block.

  Error: error ("Test ‘elpy-black-fix-code-should-do-nothing-if-already-formatted’ redefined (or loaded twice)")
    mapbacktrace(#f(compiled-function (evald func args flags) #<bytecode 0x1f93647adbae8641>))
    debug-early-backtrace()
    debug-early(error (error "Test ‘elpy-black-fix-code-should-do-nothing-if-already-formatted’ redefined (or loaded twice)"))
    signal(error ("Test ‘elpy-black-fix-code-should-do-nothing-if-already-formatted’ redefined (or loaded twice)"))
    error("Test `%s' redefined (or loaded twice)" elpy-black-fix-code-should-do-nothing-if-already-formatted)

PR Summary

PR checklist

Please make sure that the following things have been addressed (and check the relevant checkboxes):

• Commits respect our guidelines
• [?] Tests are passing properly (see here on how to run Elpy's tests)

One more test failure fixed.

I couldn't duplicate it with running ert directly, so I pushed it to the master branch of my fork where the github workflow ran and after the patch, the test elpy-black-fix-code-should-do-nothing-if-already-formatted passed

[detrout]

That was a fast merge. :)

I've found I like elpy more than dealing with eglot over tramp, so I decided to see how many test failures I can slowly fix.