Fix a crash in URItoFileName and behave like the method name says

vlc-android/src/org/videolan/vlc/Util.java

@@ -72,10 +72,7 @@ public class Util {
     }
 
     public static String URItoFileName(String URI) {
-        int sep = URI.lastIndexOf('/');
-        int dot = URI.lastIndexOf('.');
-        String name = dot >= 0 ? URI.substring(sep + 1, dot) : URI;
-        return Uri.decode(name);
+        return URItoFile(URI).getName();
     }
 
     public static String PathToURI(String path) {