fix: Remove nullish coalescing inside getter

[metal-messiah]

Removed a nullish coalescing assignment in a class getter -- which even though is claimed to be supported -- behaved badly in old versions of webkit browsers like Safari 15, some versions of Mobile Safari, and old chromium iOS browsers that use webkit.

Overview

Changed statement in EventBuffer.js class

Related Issue(s)

https://new-relic.atlassian.net/browse/NR-312050

Fixes #1174

Testing

Validated manually using LambdaTest with browser outside of supported table. Ideally, tested using an experiment build and affected customer(s)

[github-actions]

Asset Size Report

Merging this pull request will result in the following asset size changes:

Agent	Asset	Previous Size	New Size	Diff
lite	loader	30.69 kB / 11.1 kB (gzip)	30.69 kB / 11.1 kB (gzip)	0% / 0.01% (gzip)
lite	async-chunk	50.27 kB / 16.33 kB (gzip)	50.28 kB / 16.33 kB (gzip)	0.02% / 0.01% (gzip)
pro	loader	51.33 kB / 17.72 kB (gzip)	51.33 kB / 17.72 kB (gzip)	0% / 0.03% (gzip)
pro	async-chunk	96.81 kB / 29.3 kB (gzip)	96.82 kB / 29.3 kB (gzip)	0.01% / 0.01% (gzip)
spa	loader	58.98 kB / 20.1 kB (gzip)	58.98 kB / 20.1 kB (gzip)	0% / 0% (gzip)
spa	async-chunk	111.87 kB / 33.64 kB (gzip)	111.88 kB / 33.65 kB (gzip)	0.01% / 0.01% (gzip)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.45%. Comparing base (b12131c) to head (76576e2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1180   +/-   ##
=======================================
  Coverage   88.45%   88.45%           
=======================================
  Files         165      165           
  Lines        7249     7249           
  Branches     1484     1485    +1     
=======================================
  Hits         6412     6412           
  Misses        716      716           
  Partials      121      121           

Flag	Coverage Δ
unit-tests	78.85% <100.00%> (ø)

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