[lldb][test] Adjust TestTargetReadInstructionsFlavor skipIfs

Original in #134626 was
written as if it was "this or this" but it's "this and this".

So the test ran on AArch64 Linux, because Linux is not Windows.

Split out the Windows check to fix that.

Author: DavidSpickett

lldb/test/API/python_api/target/read-instructions-flavor/TestTargetReadInstructionsFlavor.py

@@ -7,7 +7,8 @@
 
 
 class TargetReadInstructionsFlavor(TestBase):
-    @skipIf(archs=no_match(["x86_64", "x86", "i386"]), oslist=["windows"])
+    @skipIfWindows
+    @skipIf(archs=no_match(["x86_64", "x86", "i386"]))
     def test_read_instructions_with_flavor(self):
         self.build()
         executable = self.getBuildArtifact("a.out")