[jfx25] RFR: 8364049: ToolBar shows overflow menu with fractional scale

[Andy Goryachev]

A clean backport of #1856 .

This is a very localized fix for the issue described in https://bugs.openjdk.org/browse/JDK-8364049 which resulted from comparing snapped and non-snapped values. The issue seems to happen only with fractional scale, that is, on Windows at 125%, 150%, 175% etc. scales.

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Commit messages:
 - Backport 4e334cb1ebbb370086d0a58bbe1d9a30d6665066

Changes: https://git.openjdk.org/jfx/pull/1863/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1863&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364049
  Stats: 60 lines in 2 files changed: 51 ins; 3 del; 6 mod
  Patch: https://git.openjdk.org/jfx/pull/1863.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1863/head:pull/1863

PR: https://git.openjdk.org/jfx/pull/1863