RFR: 8327838: Convert java/awt/FileDialog/MultipleMode/MultipleMode.html applet test to main

[Alexander Zvegintsev]

The test is converted to main.
Tested on Linux, Macos and Windows.

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

Commit messages:
 - 8327838 Convert java/awt/FileDialog/MultipleMode/MultipleMode.html applet test to main

Changes: https://git.openjdk.org/jdk/pull/18205/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18205&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327838
  Stats: 445 lines in 3 files changed: 113 ins; 332 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18205.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18205/head:pull/18205

PR: https://git.openjdk.org/jdk/pull/18205