RFR: 8327838: Convert java/awt/FileDialog/MultipleMode/MultipleMode.html applet test to main [v2]

[Alexander Zvegintsev]

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

Alexander Zvegintsev has updated the pull request incrementally with one additional commit since the last revision:

  review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18205/files
  - new: https://git.openjdk.org/jdk/pull/18205/files/d33c3178..a9f8e21b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18205&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18205&range=00-01

  Stats: 20 lines in 1 file changed: 0 ins; 8 del; 12 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