try again to kill the i2psnarkurl files

apps/i2psnark/java/src/org/klomp/snark/I2PSnarkUtil.java

@@ -211,6 +211,7 @@ public class I2PSnarkUtil {
                 out.delete();
             return null;
         }
+        out.deleteOnExit();
         String fetchURL = url;
         if (rewrite)
             fetchURL = rewriteAnnounce(url);

apps/i2psnark/java/src/org/klomp/snark/TrackerClient.java

@@ -346,7 +346,6 @@ public class TrackerClient extends I2PAppThread
     if (fetched == null) {
         throw new IOException("Error fetching " + s);
     }
-    fetched.deleteOnExit();
     
     InputStream in = null;
     try {