RFR: 8341010: JavaFX - TriangleMesh.vertexFormat Property default value is wrong.

[Florian Kirmaier]

Fixing the wrong TriangleMesh.vertexFormat property. TriangleMesh.getVertexFormat() and TriangleMesh.vertexProperty().get() initially returned different values, which are now fixed.

-------------

Commit messages:
 - JDK-8341010

Changes: https://git.openjdk.org/jfx/pull/1581/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1581&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341010
  Stats: 10 lines in 2 files changed: 9 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1581.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1581/head:pull/1581

PR: https://git.openjdk.org/jfx/pull/1581