Bug 1540368 Fix XPIDatabase migration when skipping schema versions r=kmag

Differential Revision: https://phabricator.services.mozilla.com/D34424

--HG--
extra : moz-landing-system : lando

toolkit/mozapps/extensions/internal/XPIDatabase.jsm

@@ -1391,7 +1391,7 @@ this.XPIDatabase = {
         throw error;
       }
 
-      if (inputAddons.schemaVersion == 27) {
+      if (inputAddons.schemaVersion <= 27) {
         // Types were translated in bug 857456.
         for (let addon of inputAddons.addons) {
           migrateAddonLoader(addon);