Fix incompatible SQLite query

Signed-off-by: kim (grufwub) <[email protected]>

internal/db/bundb/relationship.go

@@ -237,7 +237,7 @@ func (r *relationshipDB) AcceptFollowRequest(ctx context.Context, originAccountI
 	if _, err := r.conn.
 		NewInsert().
 		Model(follow).
-		On("CONFLICT ON CONSTRAINT follows_account_id_target_account_id_key DO UPDATE set uri = ?", follow.URI).
+		On("CONFLICT (account_id,target_account_id) DO UPDATE set uri = ?", follow.URI).
 		Exec(ctx); err != nil {
 		return nil, r.conn.ProcessError(err)
 	}