RFR: 8269026: PasswordField doesn't render bullet character on Android [v2]

[Jose Pereda]

> This PR modifies the PasswordField's bullet character used on Android, as the current unicode code is not supported for most fonts, including Roboto.

Jose Pereda has updated the pull request incrementally with one additional commit since the last revision:

  Address feedback from reviewer

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

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/537/files
  - new: https://git.openjdk.java.net/jfx/pull/537/files/5cbe3372..be073acb

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=537&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=537&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/537.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/537/head:pull/537

PR: https://git.openjdk.java.net/jfx/pull/537