RFR: 8265514: Openjfx controls running tests broken (Eclipse)

[Ambarish Rapte]

As mentioned in JBS the unit test execution fails when tests have a duplicate package name.
This was introduced by JDK-8204568: it created a test in a new package `test.javafx.css` in controls tests. A similar package already existed in graphics unit tests.
This is a simple fix to rename the package. Test is moved to existing package in controls test under `test.javafx.scene.control`

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Commit messages:
 - change test package

Changes: https://git.openjdk.java.net/jfx/pull/472/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=472&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265514
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/472.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/472/head:pull/472

PR: https://git.openjdk.java.net/jfx/pull/472