Change time.Sleep to time.Ticker in insertable streams example

[AfonsoVilalonga]

Description

Hello,

While looking at the WebRTC examples, I came across the following comment in the "play-from-disk" example:

(line 196-198)

// It is important to use a time.Ticker instead of time.Sleep because
// * avoids accumulating skew, just calling time.Sleep didn't compensate for the time spent parsing the data
// * works around latency issues with Sleep (see https://github.com/golang/go/issues/44343)

However, the "insertable streams" example still uses time.Sleep. I changed the code of the example to use time.Ticker like the "play-from-disk" example.

Reference issue

Fixes #2835

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.87%. Comparing base (021c271) to head (632aa57).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2836      +/-   ##
==========================================
- Coverage   78.90%   78.87%   -0.03%     
==========================================
  Files          89       89              
  Lines        8314     8314              
==========================================
- Hits         6560     6558       -2     
- Misses       1277     1278       +1     
- Partials      477      478       +1     

Flag	Coverage Δ
go	80.46% <ø> (-0.03%)	⬇️
wasm	64.88% <ø> (ø)

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[Sean-Der]

Works great @AfonsoVilalonga

Thank you so much! If you are interested I hope you stay involved with the project, always looking for more contributors :)