testsuite: Suppress ticks in T4918 output
testsuite: Suppress ticks in T4918 output

As noted in #16741, this test otherwise breaks when `base` is compiled
with `-g`.

sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc