Rework last ditch effort to fuse very small patches during terminate_patches

[glemieux]

Currently on the main branch, if we are having a patch that is below some minimum threshold area there is a possibility that we could merge patches with different landuse types (e.g. secondary into primary). Adding in landuse transitions (from #1040) could potentially exacerbate this case. Talking with @rgknox and @ckoven, we agreed that we should review terminate_patches and come up with ways to rework this to be a little more circumspect about if and how we merge disparate land use types patches.