[ci] brought back debug printing in server tests

tests/server/build.hxml

@@ -10,4 +10,4 @@
 # or set UTEST_PATTERN environment variable
 
 #Temporary. To find out what's wrong with random CI failures
-# --macro addMetadata('@:build(utils.macro.DebugFailures.patchAssert())', 'utest.Assert')
+--macro addMetadata('@:build(utils.macro.DebugFailures.patchAssert())', 'utest.Assert')