RFR: 8328648: Remove applet usage from JFileChooser tests bug4150029 [v8]

[Alisen Chung]

> Removing applet usage from manual JFileChooser tests

Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:

  move var into local, simplified condition check, spacing

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18415/files
  - new: https://git.openjdk.org/jdk/pull/18415/files/29486a10..ed8ed220

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18415&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18415&range=06-07

  Stats: 8 lines in 1 file changed: 1 ins; 3 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/18415.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18415/head:pull/18415

PR: https://git.openjdk.org/jdk/pull/18415