Fix order of runtime profiling args for tests (and benchmarks?)

This behaves as if only `+RTS -p` was passed, when actually the manually specified `-P` should override the `-p`.

```
~/t/profile-repro $ stack --profile test :profile-repro-test --test-arguments "+RTS -P"
profile-repro-0.1.0.0: test (suite: profile-repro-test, args: +RTS -P +RTS -p -RTS)
```

I didn't check any benchmarks but I'd suspect that the behaviour would be the same.
