fix typo in SourceInfoTransform.scala (#4594) (#4595) #6800

Job	Run time
Standard Library Tests (2.13.10)	2m 5s
Integration Tests (w/ chiseltest)	3m 41s
Standard Library Tests (2.12.17)	1m 58s
Formatting	3m 10s
ci (ubuntu-20.04, 8, 2.13.10, 2.4, firtool-1.37.0)	18m 18s
ci (ubuntu-20.04, 8, 2.12.17, 2.4, firtool-1.37.0)	18m 31s
Test Chisel Scala-CLI Example	3m 15s
check tests	1s
all tests passed	1s
publish	14m 57s
	1h 5m 57s

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