fix: double decoding of json

[manchuck]

What is this PR doing?

This is addressing cases where decoding of JSON responses where being done in the callback rather than after the request is made.

How should this be manually tested?

What are the relevant tickets?

[codecov]

Codecov Report

Attention: 39 lines in your changes are missing coverage. Please review.

Comparison is base (111be34) 63.5% compared to head (7c547f1) 81.5%.
Report is 6 commits behind head on main.

Additional details and impacted files

Files	Coverage Δ
spec/opentok_spec.js	100.0% <100.0%> (ø)
lib/moderation.js	93.1% <88.8%> (-2.6%)	⬇️
lib/signaling.js	88.8% <90.9%> (ø)
lib/opentok.js	76.4% <28.5%> (-0.4%)	⬇️
lib/client.js	93.6% <90.6%> (+14.6%)	⬆️
lib/render.js	19.6% <12.5%> (-2.0%)	⬇️
lib/callbacks.js	74.6% <77.1%> (+1.6%)	⬆️
lib/archiving.js	75.4% <77.2%> (+66.8%)	⬆️

... and 1 file with indirect coverage changes

[abdulajet]

LGTM