RFR: 8330590: TextInputControl: previous word fails with Bhojpuri characters

[Andy Goryachev]

This change replaces Character.isLetterOrDigit(char) which fails with surrogate characters with  Character.isLetterOrDigit(int).

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Commit messages:
 - 8330590 TextInputControl: previous word fails with Bhojpuri characters

Changes: https://git.openjdk.org/jfx/pull/1444/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1444&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330590
  Stats: 39 lines in 2 files changed: 36 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1444.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1444/head:pull/1444

PR: https://git.openjdk.org/jfx/pull/1444