8232077: Investigate if default behavior should allow downgrade scenario

Reviewed-by: herrick, almatvee

src/jdk.incubator.jpackage/windows/classes/jdk/incubator/jpackage/internal/WinMsiBundler.java

@@ -414,6 +414,7 @@ public class WinMsiBundler  extends AbstractBundler {
                 upgradeCode));
 
         data.put("JpAllowUpgrades", "yes");
+        data.put("JpAllowDowngrades", "yes");
 
         data.put("JpAppName", APP_NAME.fetchFrom(params));
         data.put("JpAppDescription", DESCRIPTION.fetchFrom(params));