graphical: use stable packages when possible

nix/home-manager/configuration/graphical-fullblown.nix

@@ -130,9 +130,9 @@ in {
       hexchat
       aspellDicts.en
       aspellDicts.de
-      unstablepkgs.skype
+      skype
       zoom-us # broken as of 2019-10-30
-      unstablepkgs.bluejeans-gui
+      bluejeans-gui
       thunderbird
       gnome3.evolution # gnome4.glib_networking
       tdesktop
@@ -156,7 +156,6 @@ in {
       # Remote Control Tools
       remmina
       freerdp
-      x2goclient
       teamviewer
 
       # Audio/Video Players

nix/home-manager/configuration/graphical-removable.nix

@@ -91,7 +91,6 @@ in {
       # Remote Control Tools
       remmina
       freerdp
-      x2goclient
 
       # Network Tools
       openvpn