8021186: jdk/lambda/vm/DefaultMethodsTest.java fails

Summary: remove DefaultMethodsTest from jdk/test/problemList.txt
Reviewed-by: mduigou

test/ProblemList.txt

@@ -166,9 +166,6 @@ demo/jvmti/compiledMethodLoad/CompiledMethodLoadTest.java	generic-all
 # 7027502
 demo/jvmti/hprof/MonitorTest.java                               generic-all
 
-# 8021186
-jdk/lambda/vm/DefaultMethodsTest.java                           generic-all 
-
 # 8024423 - JVMTI: GetLoadedClasses doesn't enumerate anonymous classes 
 demo/jvmti/hprof/HeapAllTest.java                               generic-all
 demo/jvmti/hprof/HeapBinaryFormatTest.java                      generic-all