RFR: 8278905 JavaFX: EnumConverter has a typo in the toString method

[Florian Kirmaier]

Fixing typo in EnumConverter

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Commit messages:
 - 8278905

Changes: https://git.openjdk.java.net/jfx/pull/697/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=697&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278905
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/697.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/697/head:pull/697

PR: https://git.openjdk.java.net/jfx/pull/697