RFR: 8196367: java/awt/List/SingleModeDeselect/SingleModeDeselect.java times out

[Alexander Zuev]

Clean up imports;
Close and dispose frame before exiting the test;

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Commit messages:
 - Remove test from the ProblemList
 - 8196367: java/awt/List/SingleModeDeselect/SingleModeDeselect.java times out

Changes: https://git.openjdk.java.net/jdk/pull/8351/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8351&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8196367
  Stats: 20 lines in 2 files changed: 9 ins; 4 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8351.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8351/head:pull/8351

PR: https://git.openjdk.java.net/jdk/pull/8351