fix: allow audio fmp4 emsg probe

[adrums86]

Description

Fixes #1379

Specific Changes proposed

Change the order of nested callbacks to the transmuxer to allow for fmp4 audio EMSG id3 metadata probing.

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #1385 (a1cef32) into main (9520070) will not change coverage.
The diff coverage is 90.90%.

@@           Coverage Diff           @@
##             main    #1385   +/-   ##
=======================================
  Coverage   85.37%   85.37%           
=======================================
  Files          40       40           
  Lines        9953     9953           
  Branches     2307     2307           
=======================================
  Hits         8497     8497           
  Misses       1456     1456           

Impacted Files	Coverage Δ
src/media-segment-request.js	95.50% <90.90%> (ø)

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[wseymour15]

LGTM