[lldb][lldb-dap] Disable another part of TestDAP_launch.py on Windows

Has been flakey on our Windows on Arm bot:
https://lab.llvm.org/buildbot/#/builders/141/builds/11373

```
======================================================================

ERROR: test_stopOnEntry (TestDAP_launch.TestDAP_launch.test_stopOnEntry)

    Tests the default launch of a simple program that stops at the

----------------------------------------------------------------------

Traceback (most recent call last):

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\lldbtest.py", line 2090, in tearDown

    Base.tearDown(self)

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\lldbtest.py", line 1105, in tearDown

    hook()  # try the plain call and hope it works

    ^^^^^^

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\tools\lldb-dap\lldbdap_testcase.py", line 521, in cleanup

    self.dap_server.terminate()

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\tools\lldb-dap\dap_server.py", line 1602, in terminate

    raise DebugAdapterProcessError(process.returncode)

dap_server.DebugAdapterProcessError: lldb-dap returned non-zero exit status 1.

Config=aarch64-C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe

----------------------------------------------------------------------
```

See llvm#137660

Author: DavidSpickett

lldb/test/API/tools/lldb-dap/launch/TestDAP_launch.py

@@ -95,6 +95,8 @@ def test_termination(self):
         # Check the return code
         self.assertEqual(self.dap_server.process.poll(), 0)
 
+    # Flakey on Windows, https://github.com/llvm/llvm-project/issues/137660.
+    @skipIfWindows
     def test_stopOnEntry(self):
         """
         Tests the default launch of a simple program that stops at the