Updates for removing non-ascii-name

[joesho112358]

Summary

Part of the effort in #9614 to incrementally remove lints

Details and comments

Only used for 3 variables in 1 file. If those variables are preferred, then we can close this and I can create a new PR to move it above the decision line.

Also, open to renaming lambda_p and such :|

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[coveralls]

Pull Request Test Coverage Report for Build 8731920963

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 9 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.009%) to 89.26%

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Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/lex.rs	3	91.6%
crates/qasm2/src/parse.rs	6	97.61%

Totals
Change from base Build 8728514558:	-0.009%
Covered Lines:	60305
Relevant Lines:	67561

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💛 - Coveralls

[jakelishman]

Thanks for looking at these lints! I'm fine with lambda_p and friends in the test file to avoid the naming conflict - it's just one test file, and just using Greek letters (whether the letter or the name) is lazy-scientist naming on our part already, so no worries.