Fix: Type error in lasagna_master_test.go by converting portions to float64

[CEOZMaze]

This pull request fixes a type error in lasagna_master_test.go. The test was failing because an integer variable tt.portions was being used where a float64 was expected. This change converts tt.portions to float64 to resolve the error.

Error message:
./lasagna_master_test.go:205:34: cannot use tt.portions (variable of type int) as float64 value in argument to ScaleRecipe

After this change, the tests should pass without any type errors.

[github-actions]

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[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

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[andrerfcsantos]

Discussion about this in this forum post: https://forum.exercism.org/t/fix-type-error-in-lasagna-master-test-go-by-converting-portions-to-float64/11517