RFR: 8297450: ScaledTextFieldBorderTest.java fails when run with -show parameter

[Rajat Mahajan]

Added createVerticalStrut in between textfields to fix this issue.

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Commit messages:
 - 8297450: ScaledTextFieldBorderTest.java fails when run with -show parameter

Changes: https://git.openjdk.org/jdk/pull/11498/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11498&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297450
  Stats: 8 lines in 1 file changed: 3 ins; 5 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11498.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11498/head:pull/11498

PR: https://git.openjdk.org/jdk/pull/11498