hash: remove pointless copy

"saved" is used only during hash table correctness analysis, which is
normally not enabled at compile time, and requires source modification
to enable.

Remove the pointless copy and save a tiny bit of CPU.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

src/bees-hash.cc

@@ -514,7 +514,9 @@ BeesHashTable::push_random_hash_addr(HashType hash, AddrType addr)
 	auto pos = distribution(generator);
 
 	int case_cond = 0;
+#if 0
 	vector<Cell> saved(er.first, er.second);
+#endif
 
 	if (found) {
 		// If hash already exists after pos, swap with pos