[lldb][test] TestConstStaticIntegralMember.py: XFAIL DWARFv4 variant on Darwin (#115401)

https://github.com/llvm/llvm-project/pull/111859 fixed these tests for
DWARFv4 on Linux by adjusting the manual index. As part of the change we
unXFAILed these tests for DWARFv4 on all platforms. However, the manual
index isn't used on macOS so they're still broken. This patch reverts
the XFAIL on Darwin for DWARFv4.

Example CI failure:
```
FAIL: test_inline_static_members_dwarf4_dsym (TestConstStaticIntegralMember.TestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/ec2-user/jenkins/workspace/llvm.org/lldb-cmake/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 1769, in test_method
    return attrvalue(self)
  File "/Users/ec2-user/jenkins/workspace/llvm.org/lldb-cmake/llvm-project/lldb/test/API/lang/cpp/const_static_integral_member/TestConstStaticIntegralMember.py", line 153, in test_inline_static_members_dwarf4
    self.check_inline_static_members("-gdwarf-4")
  File "/Users/ec2-user/jenkins/workspace/llvm.org/lldb-cmake/llvm-project/lldb/test/API/lang/cpp/const_static_integral_member/TestConstStaticIntegralMember.py", line 129, in check_inline_static_members
    self.check_global_var("A::int_val", "const int", "1")
  File "/Users/ec2-user/jenkins/workspace/llvm.org/lldb-cmake/llvm-project/lldb/test/API/lang/cpp/const_static_integral_member/TestConstStaticIntegralMember.py", line 118, in check_global_var
    self.assertGreaterEqual(len(var_list), 1)
AssertionError: 0 not greater than or equal to 1
```

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