Fixing mongodb fileWorkspaceMap keySet listing

Author: PicoCreator

src/main/java/picoded/dstack/mongodb/MongoDB_FileWorkspaceMap.java

@@ -913,7 +913,7 @@ public Set<String> keySet() {
 		HashSet<String> ret = new HashSet<String>();
 
 		// Lets fetch everything ... D=
-		DistinctIterable<String> search = collection.distinct("metadata.oid", String.class);
+		DistinctIterable<String> search = filesCollection.distinct("metadata.oid", String.class);
 
 		// Lets iterate the search
 		try (MongoCursor<String> cursor = search.iterator()) {