Android:actTrk: fix find next nonsynced rec log

apps/android/boot.js

@@ -236,8 +236,8 @@
       "listRecs": function() {
         let recs = require("Storage").list(/^recorder\.log.*\.csv$/,{sf:true}).map(s => s.slice(12, 21));
         if (event.id.length > 2) { // Handle if there was no id supplied. Then we send a list all available recorder logs back.
-        recs = recs.slice(recs.indexOf(event.id)); // FIXME: Currently does not handle if the last fetched log was deleted on the watch, so that there won't be any entry corresponding to `event.id`
-        recs.shift();
+          let isFirstNonsyncedIdx = recs.findIndex((logId) => logId > event.id);
+          recs = recs.slice(isFirstNonsyncedIdx+1);
         }
         gbSend({t:"actTrksList", list: recs}); // TODO: split up in multiple transmissions?
       },