RFR: 8282217: Key events (key char and key code) changed for Swiss keyboard

[Alisen Chung]

Removed check for MapVirtualKeyEx return value causing some keys to become undefined

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Commit messages:
 - removed check for 0x80000000 in character for dead key

Changes: https://git.openjdk.org/jdk/pull/11887/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11887&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8282217
  Stats: 4 lines in 1 file changed: 0 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11887.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11887/head:pull/11887

PR: https://git.openjdk.org/jdk/pull/11887