Don't needlessly wrap the marked content id-attribute in a string

[Snuffleupagus]

When the marked content id is defined it'll always be a string, hence wrapping it in a string when setting the attribute is pointless; note

pdf.js/src/core/evaluator.js

Lines 3529 to 3531 in e148b15

	id: Number.isInteger(mcid)
	? `${self.idFactory.getPageObjId()}_mc${mcid}`
	: null,

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.43%. Comparing base (e148b15) to head (cde4f9a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21545      +/-   ##
==========================================
+ Coverage   89.41%   89.43%   +0.01%     
==========================================
  Files         262      262              
  Lines       66739    66739              
==========================================
+ Hits        59677    59685       +8     
+ Misses       7062     7054       -8     

Flag	Coverage Δ
browsertest	66.52% <100.00%> (-0.01%)	⬇️
fonttest	9.05% <ø> (ø)
integrationtest	68.74% <100.00%> (+0.01%)	⬆️
unittest	57.34% <0.00%> (+<0.01%)	⬆️
unittestcli	56.30% <0.00%> (ø)

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[timvandermeij]

Thanks!