RFR: 8374329: PasswordField ignores custom accessible text

[Christopher Schnick]

This is a pretty simple fix for the accessible text of password fields.

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Commit messages:
 - Return proper accessible text from password field

Changes: https://git.openjdk.org/jfx/pull/2020/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=2020&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374329
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/2020.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/2020/head:pull/2020

PR: https://git.openjdk.org/jfx/pull/2020