Bug Fix for the RGBImgPartialObsWrapper view size issue

[vishwassathish]

Description

As reported in the bug, the RGBImgPartialObsWrapper ignored changes to agent_view_size parameter when rendering an RGB image. The issue was replicated and it was found that env.agent_view_size and env.unwrapped.agent_view_size had different values after applying a view size wrapper ViewSizeWrapper(env, agent_view_size=5).

Fixes # (issue)

Made a small change to the RGBImgPartialObsWrapper method in wrappers.py by adding an agent_view_size parameter. Also passed this argument to get_pov_render() and gen_obs_grid() functions in minigrid_env.py

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Screenshots

Please attach before and after screenshots of the change if applicable.

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[pseudo-rnd-thoughts]

Could you add a test for this