RFR: 7892: JMC Automated UI MasterPasswordTests is failing

[Suchita Chaturvedi]

The ui test case was not adhering to new password validation requirement, hence it was failing. This PR fixes the issue and uitests are passing after that.

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Commit messages:
 - 7892: JMC Automated UI MasterPasswordTests is failing

Changes: https://git.openjdk.org/jmc/pull/427/files
 Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=427&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-7892
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jmc/pull/427.diff
  Fetch: git fetch https://git.openjdk.org/jmc pull/427/head:pull/427

PR: https://git.openjdk.org/jmc/pull/427