Setting _time_format prevents use of _txlock

When the _time_format query parameter is present, applyQueryParams returns early, preventing the _txlock parameter from being processed.

Removing L837 (return nil) from sqlite.go (master / v1.20.3) should fix this.

https://gitlab.com/cznic/sqlite/-/blob/master/sqlite.go#L831

	if v := q.Get("_time_format"); v != "" {
		f, ok := writeTimeFormats[v]
		if !ok {
			return fmt.Errorf("unknown _time_format %q", v)
		}
		c.writeTimeFormat = f
		return nil // <-- PROBLEM LINE
	}

	if v := q.Get("_txlock"); v != "" {