Remove redundant check for method option of random_sample in interface

[benvanwerkhoven]

Note to self to remove this check which is no longer needed:
https://github.com/KernelTuner/kernel_tuner/blob/master/kernel_tuner/interface.py#L631

As all the compatibility of strategy_options with the selected strategy is already checked by:
https://github.com/KernelTuner/kernel_tuner/blob/master/kernel_tuner/interface.py#L638

[fjwillemsen]

Fixed in #287.