[pulse][tests] simplify unit tests

Summary:
Ever since the pulse solver became incremental, `normalize` has been a
no-op, yet the unit tests keep printing the hypothetical result of
`normalize`. Simplify the tests so that they only print the formula in
these cases.

Reviewed By: thizanne

Differential Revision: D62386378

fbshipit-source-id: 535b7dcd030b4b7a3c20627186e74e323792f444