RFR: 8305667: Some fonts installed in user directory are not detected on Windows

[Nikita Gubarkov]

`data` array has size of `MAX_BUFFER` like `wname`, but it has a char type, so its size is twice smaller than actual path limit, because paths returned by `RegEnumValueW` use wide chars. We need to double this limit.

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Commit messages:
 - 8305667: Some fonts installed in user directory are not detected on Windows

Changes: https://git.openjdk.org/jdk/pull/13359/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13359&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305667
  Stats: 8 lines in 1 file changed: 1 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/13359.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13359/head:pull/13359

PR: https://git.openjdk.org/jdk/pull/13359