gnome3.gtk -> gtk3

Fix building with `config.allowAliases = false;`.

pkgs/applications/networking/p2p/transmission/default.nix

···
 , pcre
   # Build options
 , enableGTK3 ? false
-, gnome3
+, gtk3
 , xorg
 , wrapGAppsHook
 , enableQt ? false
···
     pcre
   ]
   ++ lib.optionals enableQt [ qt5.qttools qt5.qtbase ]
-  ++ lib.optionals enableGTK3 [ gnome3.gtk xorg.libpthreadstubs ]
+  ++ lib.optionals enableGTK3 [ gtk3 xorg.libpthreadstubs ]
   ++ lib.optionals enableSystemd [ systemd ]
   ++ lib.optionals stdenv.isLinux [ inotify-tools ]
   ;

pkgs/applications/networking/pcloud/default.nix

···
   # Runtime dependencies;
   # A few additional ones (e.g. Node) are already shipped together with the
   # AppImage, so we don't have to duplicate them here.
-  alsaLib, dbus-glib, fuse, gnome3, libdbusmenu-gtk2, udev, nss
+  alsaLib, dbus-glib, fuse, gnome3, gtk3, libdbusmenu-gtk2, udev, nss
 }:
 
 let
···
     alsaLib
     dbus-glib
     fuse
-    gnome3.gtk
+    gtk3
     libdbusmenu-gtk2
     nss
     udev
···
 
     # This is required for the file picker dialog - otherwise pcloud just
     # crashes
-    export XDG_DATA_DIRS="${gnome3.gsettings-desktop-schemas}/share/gsettings-schemas/${gnome3.gsettings-desktop-schemas.name}:${gnome3.gtk}/share/gsettings-schemas/${gnome3.gtk.name}:$XDG_DATA_DIRS"
+    export XDG_DATA_DIRS="${gnome3.gsettings-desktop-schemas}/share/gsettings-schemas/${gnome3.gsettings-desktop-schemas.name}:${gtk3}/share/gsettings-schemas/${gtk3.name}:$XDG_DATA_DIRS"
 
     exec "$out/app/pcloud"
     EOF

pkgs/applications/video/webtorrent_desktop/default.nix

···
 {
   alsaLib, atk, cairo, cups, dbus, dpkg, expat, fetchurl, fetchzip, fontconfig, freetype,
-  gdk-pixbuf, glib, gnome3, libX11, libXScrnSaver, libXcomposite, libXcursor,
+  gdk-pixbuf, glib, gtk3, libX11, libXScrnSaver, libXcomposite, libXcursor,
   libXdamage, libXext, libXfixes, libXi, libXrandr, libXrender, libXtst,
   libxcb, nspr, nss, lib, stdenv, udev, libuuid, pango, at-spi2-atk, at-spi2-core
 }:
···
     freetype
     gdk-pixbuf
     glib
-    gnome3.gtk
+    gtk3
     pango
     libuuid
     libX11

pkgs/applications/window-managers/wayfire/wcm.nix

···
 { stdenv, lib, fetchurl, meson, ninja, pkg-config, wayland, wrapGAppsHook
-, gnome3, libevdev, libxml2, wayfire, wayland-protocols, wf-config, wf-shell
+, gtk3, libevdev, libxml2, wayfire, wayland-protocols, wf-config, wf-shell
 }:
 
 stdenv.mkDerivation rec {
···
 
   nativeBuildInputs = [ meson ninja pkg-config wayland wrapGAppsHook ];
   buildInputs = [
-    gnome3.gtk libevdev libxml2 wayfire wayland
+    gtk3 libevdev libxml2 wayfire wayland
     wayland-protocols wf-config wf-shell
   ];