RFR: 8230231: font-family not updated in HTMLEditor

[Hadzic Samir]

Fix for https://github.com/javafxports/openjdk-jfx/issues/573

Issue on JDK bug tracking : https://bugs.openjdk.java.net/browse/JDK-8230231

I tried to add a test but I do not succeed at even running the existing Web tests.. I will need some help on that side..

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Commits:
 - e9df9db5: Adding double-quote for HTMLEditorSkin font-family

Changes: https://git.openjdk.java.net/jfx/pull/12/files
 Webrev: https://webrevs.openjdk.java.net/jfx/12/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8230231
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jfx/pull/12.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/12/head:pull/12

PR: https://git.openjdk.java.net/jfx/pull/12