RFR: 8322545: Declare newInsets as static in ThemeReader.cpp

[Rajat Mahajan]

8322545: Declare newInsets as static in ThemeReader.cpp

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

Commit messages:
 - 8322545: Declare newInsets as static in ThemeReader.cpp

Changes: https://git.openjdk.org/jdk/pull/17310/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17310&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322545
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17310.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17310/head:pull/17310

PR: https://git.openjdk.org/jdk/pull/17310