Revert "Implement overwriting pathgrid records"

This broke pathgrid loading in exterior cells due to an unexpected problem in the pathgrid record system (bug #2195).

This reverts commit dd0cea21b0.

apps/openmw/mwworld/store.hpp

@@ -876,36 +876,8 @@ namespace MWWorld
     public:
 
         void load(ESM::ESMReader &esm, const std::string &id) {
-
-            ESM::Pathgrid pathgrid;
-            pathgrid.load(esm);
-
-            // Try to overwrite existing record
-            // Can't use search() because we aren't sorted yet
-            if (!pathgrid.mCell.empty())
-            {
-                for (std::vector<ESM::Pathgrid>::iterator it = mStatic.begin(); it != mStatic.end(); ++it)
-                {
-                    if ((*it).mCell == pathgrid.mCell)
-                    {
-                        (*it) = pathgrid;
-                        return;
-                    }
-                }
-            }
-            else
-            {
-                for (std::vector<ESM::Pathgrid>::iterator it = mStatic.begin(); it != mStatic.end(); ++it)
-                {
-                    if ((*it).mData.mX == pathgrid.mData.mX && (*it).mData.mY == pathgrid.mData.mY)
-                    {
-                        (*it) = pathgrid;
-                        return;
-                    }
-                }
-            }
-
-            mStatic.push_back(pathgrid);
+            mStatic.push_back(ESM::Pathgrid());
+            mStatic.back().load(esm);
         }
 
         size_t getSize() const {