Remove spurious store to pagemap

The same operation was just done one the other side of the loop above
and the loop does not modify this location in the map.

src/mem/chunkmap.h

@@ -211,8 +211,6 @@ namespace snmalloc
           ss, static_cast<uint8_t>(64 + i + SUPERSLAB_BITS), run);
         ss = ss + SUPERSLAB_SIZE * run;
       }
-      PagemapProvider::pagemap().set(
-        address_cast(p), static_cast<uint8_t>(size_bits));
     }
     /**
      * Update the pagemap to remove a large allocation, of `size` bytes from