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.

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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.

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