Address feedback

apps/openmw/mwworld/store.cpp

@@ -902,9 +902,7 @@ namespace MWWorld
         // we assume that these records are empty on purpose (i.e. to remove old pathgrid on an updated cell)
         if (isDeleted || pathgrid.mPoints.empty() || pathgrid.mEdges.empty())
         {
-            auto it = mStatic.find(cell);
+            mStatic.erase(cell);
-            if (it != mStatic.end())
-                mStatic.erase(it);
 
             return RecordId(ESM::RefId(), isDeleted);
         }

apps/openmw/mwworld/store.hpp

@@ -414,7 +414,6 @@ namespace MWWorld
     class Store<ESM::Pathgrid> : public DynamicStore
     {
     private:
-
         std::unordered_map<ESM::RefId, ESM::Pathgrid> mStatic;
         Store<ESM::Cell>* mCells;