[lldb/test] Skip `SBTarget::IsLoaded` test on windows (NFC)

This patch skips the test for the SBTarget::IsLoaded method on windows
since the logic is different.

Differential Revision: https://reviews.llvm.org/D95686

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>

lldb/test/API/python_api/target/TestTargetAPI.py

@@ -491,6 +491,7 @@ class TargetAPITestCase(TestBase):
 
 
     @add_test_categories(['pyapi'])
+    @skipIfWindows
     def test_is_loaded(self):
         """Exercise SBTarget.IsLoaded(SBModule&) API."""
         d = {'EXE': 'b.out'}