Use routetable.MaxWaitingOriginChanges in the prefix handler test

The test now reads the exported limit instead of its own copy of the number.

Model: deepseek-v4-pro

internal/routewatch/prefixhandler_originchanges_internal_test.go

@@ -14,10 +14,6 @@ import (
 	"git.eeqj.de/sneak/routewatch/internal/routetable"
 )
 
-// waitingOriginChangesLimit is the routing table's maxWaitingOriginChanges,
-// which this package cannot read.
-const waitingOriginChangesLimit = 100000
-
 // TestPrefixHandlerWritesOriginChanges hands a running prefix handler an
 // announcement and flushes. The flush must write the origin change to the
 // database.
@@ -149,7 +145,7 @@ func TestPrefixHandlerLogsTheDroppedOriginChanges(t *testing.T) {
 			&slog.HandlerOptions{Level: slog.LevelWarn})),
 	}
 
-	announceManyPrefixes(h.table, waitingOriginChangesLimit+1)
+	announceManyPrefixes(h.table, routetable.MaxWaitingOriginChanges+1)
 
 	h.flushBatch()