RFR: 8252783: Remove the css Selector and ShapeConverter constructors

[Ajit Ghaisas]

The javafx.css.Selector and javafx.css.converter.ShapeConverter constructors were deprecated for removal in openjfx16.
This PR removes these constructors (targeted for openjfx17).

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Commit messages:
 - 8252783 fix

Changes: https://git.openjdk.java.net/jfx/pull/512/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=512&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252783
  Stats: 8 lines in 2 files changed: 0 ins; 5 del; 3 mod
  Patch: https://git.openjdk.java.net/jfx/pull/512.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/512/head:pull/512

PR: https://git.openjdk.java.net/jfx/pull/512