nixos/teamviewer: fix issue #44307

Move to a forefront launch of the daemon. Doing so allowed us
to move the service from forking to simple to avoid the
missing pid  error log.

Also:

 -  Make the dbus dependency explicit.

nixos/modules/services/monitoring/teamviewer.nix

@@ -30,14 +30,15 @@ in
       description = "TeamViewer remote control daemon";
 
       wantedBy = [ "multi-user.target" ];
-      after = [ "NetworkManager-wait-online.service" "network.target" ];
+      after = [ "NetworkManager-wait-online.service" "network.target" "dbus.service" ];
+      requires = [ "dbus.service" ];
       preStart = "mkdir -pv /var/lib/teamviewer /var/log/teamviewer";
 
       startLimitIntervalSec = 60;
       startLimitBurst = 10;
       serviceConfig = {
-        Type = "forking";
-        ExecStart = "${pkgs.teamviewer}/bin/teamviewerd -d";
+        Type = "simple";
+        ExecStart = "${pkgs.teamviewer}/bin/teamviewerd -f";
         PIDFile = "/run/teamviewerd.pid";
         ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
         Restart = "on-abort";