Updated DQN optimizer input to only include q_network parameters as input

[corentinlger]

Updated DQN optimizer input to only include q_network parameters as input (similarly to what is done in SAC)

stable-baselines3/stable_baselines3/sac/policies.py

Line 304 in 4efee92

critic_parameters,

I didn't modify the tests because it seems they were already checking the right thing before (what we discussed in #1946).

Do you think it solves the problem ?

Description

Motivation and Context

• I have raised an issue to propose this change (required for new features and bug fixes)

closes #1946

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)

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• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.
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• I have opened an associated PR on the RL-Zoo3 repository (if necessary)
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[araffin]

LGTM, thanks =)

Could you do a similar PR for QR-DQN in SB3 contrib?

[corentinlger]

Sure I'm gonna do that