mlang/tests: Add another possible failure for Win2k.

dlls/mlang/tests/mlang.c

@@ -1946,7 +1946,9 @@ static void test_IsCodePageInstallable(IMultiLanguage2 *ml2)
          * up an installation dialog on some platforms, even when specifying CPIOD_PEEK.
          */
         if (IsValidCodePage(i))
-            ok(hr == S_OK || broken(hr == E_INVALIDARG),  /* win2k */
+            ok(hr == S_OK ||
+               broken(hr == S_FALSE) ||  /* win2k */
+               broken(hr == E_INVALIDARG),  /* win2k */
                "code page %u is valid but not installable 0x%08x\n", i, hr);
     }
 }