[lldb] Re-add X-Fail for Windows to TestDollarInVariable

This got removed by accident in 048d11de43 when
the test was rewritten as a non-inline test.

lldb/test/API/commands/expression/dollar-in-variable/TestDollarInVariable.py

@@ -7,6 +7,7 @@ class TestCase(TestBase):
 
     mydir = TestBase.compute_mydir(__file__)
 
+    @expectedFailureAll(oslist=["windows"])
     def test(self):
         self.build()
         lldbutil.run_to_source_breakpoint(self, "// break here", lldb.SBFileSpec("main.c"))