RFR: 8262293: Remove redundant end of encoder for AAShader rendering

[Alexey Ushakov]

We don't need to end an encoder before/after AAShader rendering

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Commit messages:
 - 8262293: Remove redundant end of encoder for AAShader rendering

Changes: https://git.openjdk.java.net/lanai/pull/202/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=202&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262293
  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/lanai/pull/202.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/202/head:pull/202

PR: https://git.openjdk.java.net/lanai/pull/202