Claim files for non-existent worlds are deleted.

Previously were not being deleted due to a bug (input stream left open,
file not deletable).

src/me/ryanhamshire/GriefPrevention/FlatFileDataStore.java

@@ -338,6 +338,7 @@ public class FlatFileDataStore extends DataStore
 				{
 					if(e.getMessage().contains("World not found"))
 					{
+					    inStream.close();
 					    files[i].delete();
 					}
 					else