fix: digitimes recipe — tick SaveID checkbox on password step

The only checkbox on join.asp is SaveID (remember email); extend the
tick pattern with save|. Session TTL on this site is short and there is
no keep-me-signed-in option, so preflight-before-harvest is the primary
mechanism; form login frequency stays at most once per harvest.

skills/news-harvester/logins/digitimes-feed.json

@@ -17,7 +17,7 @@
       "checks": [
         {
           "selector": "input[type=checkbox]",
-          "where": "keep|remember|signed|stayed|记住|保持"
+          "where": "save|keep|remember|signed|记住|保持"
         }
       ],
       "submit": "button[type=submit][name=Submit], button.inlineBtn",