[OrderedSet] Don't set a default value for the primary initializer's second argument

This will hopefully prevent issues like the one fixed in the previous commit from reoccurring in the future.

Author: lorentey

Sources/OrderedCollections/OrderedSet/OrderedSet.swift

@@ -247,7 +247,7 @@ public struct OrderedSet<Element> where Element: Hashable
   @inlinable
   internal init(
     _uniqueElements: ContiguousArray<Element>,
-    _ table: _HashTable? = nil
+    _ table: _HashTable?
   ) {
     self.__storage = table?._storage
     self._elements = _uniqueElements