[lldb] Un-XFAIL TestFormatters on windows

The test passes after D96779.

lldb/test/API/commands/expression/formatters/TestFormatters.py

@@ -21,7 +21,6 @@ class ExprFormattersTestCase(TestBase):
         self.line = line_number('main.cpp',
                                 '// Stop here')
 
-    @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr21765")
     @skipIfTargetAndroid()  # skipping to avoid crashing the test runner
     @expectedFailureAndroid('llvm.org/pr24691')  # we hit an assertion in clang
     def test(self):