[home] Update syncthingtray config

Change from explicitly launching syncthingtray to just having it
accessible. I attempted to get plasma-manager to automatically add the
plasmoid but was unsuccessful.

home/home.nix

@@ -57,6 +57,7 @@ in
     pkgs.ncdu
     pkgs.nextcloud-talk-desktop
     pkgs.openscad-unstable
+    pkgs.syncthingtray
     pkgs.pandoc
     #pkgs.pinentry-qt
     #pkgs.pytest
@@ -193,10 +194,6 @@ in
 
   services.syncthing = {
     enable = true;
-    tray = {
-      enable = true;
-      command = "syncthingtray --wait";
-    };
   };
 
   xdg.enable = true;