[BugFix] Fix wrong assertion about collector and buffer

[vmoens]

Fix this error in the CI

RuntimeError('replay_buffer must be provided when async_collection is True')

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/3176

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❌ 2 New Failures, 35 Pending, 1 Unrelated Failure

As of commit f5be451 with merge base 5f1eb2c ():

NEW FAILURES - The following jobs have failed:

• Lint / c-source / linux-job (gh)
  The process '/usr/bin/git' failed with exit code 128
• Lint / python-source-and-configs / linux-job (gh)
  The process '/usr/bin/git' failed with exit code 128

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Habitat Tests on Linux / tests (3.9, 12.8) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128

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