Do not round up cutoff

We round up the cutoff to the next integer so far.
That's maybe necessary for the pynisher but in all other use cases (where we don't limit the runtime within SMAC) we should not touch the cutoff. Therefore, I would propose to drop the rounding in execute_ta_run.

Start at the execute_ta_run entry point and inspect where the cutoff is rounded. Verify that non-pynisher runs preserve the supplied cutoff while retaining any required behavior for pynisher; done means the cutoff is no longer rounded in the other use cases.

Written by the indexing model from the issue text.