RFR: JDK-8288993: Make AwtFramePackTest generic by removing @requires tag

[Harshitha Onkar]

The following test was changed to generic based on this [Review Comment](https://urldefense.com/v3/__https://github.com/openjdk/jdk/pull/9118*discussion_r897553780__;Iw!!ACWV5N9M2RV99hQ!Lvy6J9KfgCVA-2ID-oLD9YoyDyMh8Q_Go0rcyfxSVvBfdnsqtHuQV6n-qliRfxxnFGqCpYw6GNVsyMavk4WIGyE0$ ) and as the condition `frame.getSize() == frame.getPreferredSize() ` should hold on all platforms when frame.pack() is used.

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Commit messages:
 - removed @requires tag

Changes: https://git.openjdk.org/jdk/pull/9248/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9248&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288993
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9248.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9248/head:pull/9248

PR: https://git.openjdk.org/jdk/pull/9248