synced with rev 1.11 from OpenTracker cvs, ignore read only volumes when building the navigation menu for the unified Trash folder

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17052 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/tracker/NavMenu.cpp

@@ -421,7 +421,7 @@ BNavMenu::StartBuildingItemList()
 		fContainer = new EntryIteratorList();
 		
 		while (volRoster.GetNextVolume(&volume) == B_OK) {
-			if (!volume.IsPersistent())
+			if (volume.IsReadOnly() || !volume.IsPersistent())
 				continue;
 			
 			BDirectory trashDir;