viber: fix evaluation for nox-review

Even broken packages ought to evaluate, or die. Especially when
less than a month (!) old...

pkgs/applications/networking/instant-messengers/viber/default.nix

···
-{ fetchurl, stdenv, dpkg, makeWrapper, xlibs, qt5, gstreamer, zlib, sqlite, libxslt }:
+{ fetchurl, stdenv, dpkg, makeWrapper, xlibs, qt5Full, gstreamer, zlib, sqlite, libxslt }:
 
 assert stdenv.system == "x86_64-linux";
 
···
   unpackPhase = "true";
 
   libPath = stdenv.lib.makeLibraryPath [
-      qt5
+      qt5Full
       xlibs.libX11
       gstreamer
       zlib