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 8171662535

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 24 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.03%) to 89.272%

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Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/lex.rs	6	92.19%
crates/qasm2/src/parse.rs	18	96.69%

Totals
Change from base Build 8146086731:	-0.03%
Covered Lines:	58896
Relevant Lines:	65974

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💛 - Coveralls