Fixing compress expectation for new microserver (#7463)

The new 1.0.6 microserver generates a body such that the content length
for it is 71 instead of 30 for one of the tests. Updating the gold file
to match this expectation.

(cherry picked from commit 0e9d179)

tests/gold_tests/pluginTest/compress/compress.gold

@@ -184,5 +184,5 @@
 < Content-Type: text/javascript
 < Content-Encoding: gzip
 < Vary: Accept-Encoding
-< Content-Length: 30
+< Content-Length: 71
 ===