[jdk17u] RFR: 8274606: Fix jaxp/javax/xml/jaxp/unittest/transform/SurrogateTest.java test

[Alex Kasko]

Clean backport of a JAXP test fix.

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Commit messages:
 - Backport 7eb0372e55f23275b12470593adc97f1b79bc965

Changes: https://git.openjdk.java.net/jdk17u/pull/231/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=231&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274606
  Stats: 10 lines in 1 file changed: 3 ins; 1 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/231.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/231/head:pull/231

PR: https://git.openjdk.java.net/jdk17u/pull/231