Change how the ParlAI chat world is loaded throughout

[EricMichaelSmith]

Apply the path fix in #302 to two other places in the code

[codecov-io]

Codecov Report

Merging #319 (581dea5) into master (c10cdc4) will decrease coverage by 0.16%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
- Coverage   66.16%   66.00%   -0.17%     
==========================================
  Files          76       76              
  Lines        6710     6710              
==========================================
- Hits         4440     4429      -11     
- Misses       2270     2281      +11     

Impacted Files	Coverage Δ
...ns/blueprints/parlai_chat/parlai_chat_blueprint.py	41.12% <0.00%> (ø)
.../blueprints/parlai_chat/parlai_chat_task_runner.py	31.29% <0.00%> (ø)
...tractions/architects/channels/websocket_channel.py	79.06% <0.00%> (-3.49%)	⬇️
mephisto/data_model/packet.py	96.77% <0.00%> (-3.23%)	⬇️
mephisto/abstractions/architects/mock_architect.py	88.88% <0.00%> (-2.62%)	⬇️
mephisto/operations/supervisor.py	77.28% <0.00%> (-0.75%)	⬇️

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[JackUrb]

Nice, though the next improvement is likely going to be the ability to directly pass the module itself over via SharedTaskState, as was partially introduced here.

I note that the ParlAIChatTaskRunner is not actually prepared to load in a shared-state provided world module yet, so this doesn't need to happen immediately.