[lldb][test] XFAIL TestCppReferenceToOuterClass.py for now

The intention was to only fail this test when
`plugin.typesystem.clang.experimental-redecl-completion=false`, but
it seems like when the setting is not passed explicitly to `dotest`
the decorator is a no-op.

XFAIL this again until we figure out the decoartor properly.

Author: Michael137

lldb/test/API/lang/cpp/reference-to-outer-type/TestCppReferenceToOuterClass.py

@@ -5,7 +5,7 @@
 
 
 class TestCase(TestBase):
-    @expectedFailureAll(setting=('plugin.typesystem.clang.experimental-redecl-completion', 'false'))
+    @expectedFailure("The fix for this was reverted due to llvm.org/PR52257")
     def test(self):
         self.build()
         self.dbg.CreateTarget(self.getBuildArtifact("a.out"))