RFR: 8311585: Add JRadioButtonMenuItem to bug8031573.java [v2]

[Rajat Mahajan]

> I have made the test changes to include radio button in menu and tested the same and it works fine.

Rajat Mahajan has updated the pull request incrementally with one additional commit since the last revision:

  Update test/jdk/javax/swing/JMenuItem/8031573/bug8031573.java
  
  Co-authored-by: Alexey Ivanov <alexey.ivanov at oracle.com>

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15441/files
  - new: https://git.openjdk.org/jdk/pull/15441/files/7ea62c24..b7c5dd84

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15441&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15441&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15441.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15441/head:pull/15441

PR: https://git.openjdk.org/jdk/pull/15441