As discussed in #1778, those test does not need to be parameterized, we therefore can replace `@ParameterizedTest` and `@MethodSource` with `@Test`.
------------- Commit messages: - 8354794: [TestBug] LocalDateTimeStringConverterTest: Not all Tests needs to be parameterized Changes: https://git.openjdk.org/jfx/pull/1782/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1782&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8354794 Stats: 7 lines in 1 file changed: 1 ins; 3 del; 3 mod Patch: https://git.openjdk.org/jfx/pull/1782.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1782/head:pull/1782 PR: https://git.openjdk.org/jfx/pull/1782
