gnu: qjackctl: Build with JACK 1.

We build all packages with JACK 1.  It is compatible with JACK 2, which users
may install to get additional features.

* gnu/packages/audio.scm (qjackctl)[inputs]: Replace "jack-2" with "jack-1".

gnu/packages/audio.scm

@@ -1880,7 +1880,7 @@ and ALSA.")
     (arguments
      '(#:tests? #f)) ; no check target
     (inputs
-     `(("jack-2" ,jack-2)
+     `(("jack" ,jack-1)
        ("qtbase" ,qtbase)
        ("qtx11extras" ,qtx11extras)))
     (native-inputs