crawl: somebody should set max_transid

The previous commit had both max_transid assigments commented out.
It happens to work because we set max_transid in the constructor and
it doesn't change after that, but it's cleaner to assign it explicitly.

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

src/bees-roots.cc

@@ -868,7 +868,7 @@ BeesCrawl::fetch_extents()
 	// new references, and max_transid filtering in the kernel locks
 	// the filesystem while slowing us down.
 	// sk.max_transid = old_state.m_max_transid;
-	// sk.max_transid = numeric_limits<uint64_t>::max();
+	sk.max_transid = numeric_limits<uint64_t>::max();
 	sk.nr_items = BEES_MAX_CRAWL_SIZE;
 
 	// Lock in the old state