<AWT Dev> RFR: 8253147: The javax/swing/JPopupMenu/7154841/bug7154841.java fail on big screens

[Sergey Bylokhov]

This test creates a big popup menu and assumes that 100 popup items overlap the screen height, but on some big screens
more items should be added. + small cleanup

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Commit messages:
 - Update tests

Changes: https://git.openjdk.java.net/jdk/pull/165/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=165&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253147
  Stats: 5 lines in 2 files changed: 1 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/165.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/165/head:pull/165

PR: https://git.openjdk.java.net/jdk/pull/165