firefox/wrapper: Use plasma-browser-integration correctly

Don't rely on the attribute from the aliases.nix, as ofborg checks that
in PRs.

pkgs/applications/networking/browsers/firefox/wrapper.nix

@@ -4,7 +4,7 @@
 , flashplayer, hal-flash
 , ffmpeg, xorg, alsaLib, libpulseaudio, libcanberra-gtk2, libglvnd
 , gnome3/*.gnome-shell*/
-, browserpass, chrome-gnome-shell, uget-integrator, plasma-browser-integration, bukubrow
+, browserpass, chrome-gnome-shell, uget-integrator, plasma5, bukubrow
 , tridactyl-native
 , fx_cast_bridge
 , udev
@@ -65,7 +65,7 @@ let
           ++ lib.optional (cfg.enableTridactylNative or false) tridactyl-native
           ++ lib.optional (cfg.enableGnomeExtensions or false) chrome-gnome-shell
           ++ lib.optional (cfg.enableUgetIntegrator or false) uget-integrator
-          ++ lib.optional (cfg.enablePlasmaBrowserIntegration or false) plasma-browser-integration
+          ++ lib.optional (cfg.enablePlasmaBrowserIntegration or false) plasma5.plasma-browser-integration
           ++ lib.optional (cfg.enableFXCastBridge or false) fx_cast_bridge
           ++ extraNativeMessagingHosts
         );