fix: post encoding for client

[manchuck]

What is this PR doing?

How should this be manually tested?

What are the relevant tickets?

[codecov]

Codecov Report

Merging #318 (bd57982) into main (111be34) will increase coverage by 18.0%.
Report is 5 commits behind head on main.
The diff coverage is 79.5%.

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% <90.7%> (+14.7%)	⬆️
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

[conshus]

Cool. You answered my questions. Looks good to me.