RFR: 8343549: SeededSecureRandomTest needn't be in a package

[Weijun Wang]

The test was mistakenly put in a package as the library class it's testing. This is unnecessary since there is no internal field/method it needs access to.

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Commit messages:
 - 8343549: SeededSecureRandomTest needn't be in a package

Changes: https://git.openjdk.org/jdk/pull/21881/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21881&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343549
  Stats: 4 lines in 1 file changed: 1 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21881.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21881/head:pull/21881

PR: https://git.openjdk.org/jdk/pull/21881