add missing build dependency on nodejs

debian/control

 Priority: extra
 Maintainer: Jitsi Team <dev@jitsi.org>
 Uploaders: Emil Ivov <emcho@jitsi.org>, Damian Minkov <damencho@jitsi.org>
-Build-Depends: debhelper (>= 8.0.0)
+Build-Depends: debhelper (>= 8.0.0), nodejs
 Standards-Version: 3.9.6
 Homepage: https://jitsi.org/meet