Remove fractional grid check on adding land increments

[ClaraDraper-NOAA]

There is currently a check in cycle.f90 preventing the routine to add land increments from being called if fractional grids is turned on. This check is unnecessary, and can be removed.

Note: the routine for adding snow increments is specific to Noah, and does not work with fractional grids - this is a separate check.

[ClaraDraper-NOAA]

@GeorgeGayno-NOAA Sorry for not catching this earlier. I want to double check that there are no issues with the STC (which can hold the ocean temps in non-land grid cells), then I'll submit a PR to fix it.