Remove unused HasFinerNeighbors tracking

Keep PR focused on coarser neighbor optimization

Author: lroberts36

src/mesh/mesh-gmg.cpp

@@ -96,8 +96,8 @@ void SetMeshBlockNeighbors(Mesh *pmesh, GridIdentifier grid_id, BlockList_t &blo
     if (grid_id.type == GridType::leaf) {
       pmb->neighbors = all_neighbors;
       for (const auto &n : all_neighbors) {
-        if (n.loc.level() > pmb->loc.level()) pmb->has_finer_neighbors_ = true;
-        if (n.loc.level() < pmb->loc.level()) pmb->has_coarser_neighbors_ = true;
+        if (n.loc.level() < pmb->loc.level())
+            pmb->has_coarser_neighbors_ = true;
       }
     } else if (grid_id.type == GridType::two_level_composite &&
                pmb->loc.level() == grid_id.logical_level) {

src/mesh/meshblock.hpp

@@ -202,7 +202,6 @@ class MeshBlock : public std::enable_shared_from_this<MeshBlock> {
   }
 
   bool HasCoarserNeighbors() const { return has_coarser_neighbors_; }
-  bool HasFinerNeighbors() const { return has_finer_neighbors_; }
 
   BoundaryFlag boundary_flag[6];
 
@@ -504,7 +503,6 @@ class MeshBlock : public std::enable_shared_from_this<MeshBlock> {
   std::vector<NeighborBlock> gmg_leaf_neighbors;
 
   bool has_coarser_neighbors_ = false;
-  bool has_finer_neighbors_ = false;
 };
 
 using BlockList_t = std::vector<std::shared_ptr<MeshBlock>>;