restore: when restoring apps, use the latest backup id

this ignores the user provided site information. the site contents may or may
not contain this app.

src/apps.js

@@ -2864,7 +2864,8 @@ async function restoreApps(apps, options, auditSource) {
         let installationState, restoreConfig;
         if (!error && result.length) {
             installationState = exports.ISTATE_PENDING_RESTORE;
-            restoreConfig = { remotePath: result[0].remotePath, backupSite: options.backupSite };
+            // intentionally ignore options.backupSite since the site may not have all the apps
+            restoreConfig = { backupId: result.id };
         } else {
             installationState = exports.ISTATE_PENDING_INSTALL;
             restoreConfig = null;