Fix deepspeed scheduler initialization

[rohitgr7]

What does this PR do?

Fixes #11694

Does your PR introduce any breaking changes? If yes, please list them.

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Did you have fun?

Make sure you had fun coding 🙃

cc @Borda @SeanNaren @awaelchli @rohitgr7

[carmocca]

Still draft? LGTM!

[rohitgr7]

Still draft? LGTM!

waiting for the user's confirmation this time over the issue... hahah... forgot to test it last time so making sure it's working now.

[awaelchli]

@rohitgr7 is on fire!