[lldb] Un-XFAIL TestDeadStrip.py on windows

I suspect it was fixed by llvm#127059. aarch64 is the only windows bot we have now, so it's can't be certain it's fixed everywhere, but also I have no reason to believe otherwise.

Fixes llvm#43774.

Author: labath

lldb/test/API/functionalities/dead-strip/TestDeadStrip.py

@@ -10,7 +10,6 @@
 
 
 class DeadStripTestCase(TestBase):
-    @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr44429")
     def test(self):
         """Test breakpoint works correctly with dead-code stripping."""
         self.build()