Change useFloyd heuristic to match comment

Comment says exceed, but this checks if it is less than the limit.

Author: AZero13

Sources/HeapModule/Heap.swift

@@ -381,7 +381,7 @@ extension Heap {
     //
     // FIXME: Write a benchmark to verify this heuristic.
     let heuristicLimit = 2 * newCount / newCount._binaryLogarithm()
-    let useFloyd = (newCount - origCount) < heuristicLimit
+    let useFloyd = (newCount - origCount) > heuristicLimit
     _update { handle in
       if useFloyd {
         handle.heapify()