RFR: 8328247: Remove redundant dir for tests converted from applet to main

[Prasanta Sadhukhan]

Few tests were converted from applet manual to main using PassFailJFrame manual framework but the extra folder was not deleted

javax/swing/JFileChooser/6798062/bug6798062.java
javax/swing/JFileChooser/FileFilterDescription/FileFilterDescription.html
javax/swing/JInternalFrame/6726866/bug6726866.java 

so tests are now moved to one folder up..

-------------

Commit messages:
 - Remove redundant dir

Changes: https://git.openjdk.org/jdk/pull/18322/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18322&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328247
  Stats: 0 lines in 3 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18322.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18322/head:pull/18322

PR: https://git.openjdk.org/jdk/pull/18322