Deskbar: Get rid of the "Restart Tracker" menu item.

Now that launch_daemon automatically restarts Tracker and Deskbar
when they crash, this is not needed anymore.

src/apps/deskbar/BarApp.cpp

@@ -643,13 +643,6 @@ TBarApp::MessageReceived(BMessage* message)
 			run_be_about();
 			break;
 
-		case kRestartTracker:
-		{
-			BRoster roster;
-			roster.Launch(kTrackerSignature);
-			break;
-		}
-
 		case B_LOCALE_CHANGED:
 		{
 			BLocaleRoster::Default()->Refresh();

src/apps/deskbar/BarApp.h

@@ -60,7 +60,6 @@ const uint32 kAddTeam = 'AdTm';
 const uint32 kRemoveTeam = 'RmTm';
 const uint32 kRestart = 'Rtrt';
 const uint32 kShutDown = 'ShDn';
-const uint32 kRestartTracker = 'Trak';
 
 // from roster_private.h
 const uint32 kShutdownSystem = 301;

src/apps/deskbar/DeskbarMenu.cpp

@@ -236,13 +236,6 @@ TDeskbarMenu::AddStandardDeskbarMenuItems()
 		dragging = fBarView->Dragging();
 
 	BMenuItem* item;
-	BRoster roster;
-	if (!roster.IsRunning(kTrackerSignature)) {
-		item = new BMenuItem(B_TRANSLATE("Restart Tracker"),
-			new BMessage(kRestartTracker));
-		AddItem(item);
-		AddSeparatorItem();
-	}
 
 // One of them is used if HAIKU_DISTRO_COMPATIBILITY_OFFICIAL, and the other if
 // not. However, we want both of them to end up in the catalog, so we have to