Fix a misprint in a formula in two_qubit_decompose (backport #11953)

[mergify]

This is an automatic backport of pull request #11953 done by Mergify.

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[coveralls]

Pull Request Test Coverage Report for Build 8171662494

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.009%) to 86.92%

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Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/lex.rs	3	91.94%

Totals
Change from base Build 8097336703:	0.009%
Covered Lines:	75065
Relevant Lines:	86361

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💛 - Coveralls