fix mysql query for pagination. page number should be multiply by limit to get the offset

lib/api.js

@@ -461,7 +461,7 @@ app.get('/pool/payments', function (req, res) {
     let limit = typeof(req.query.limit) !== 'undefined' ? Number(req.query.limit) : 10;
     let page = typeof(req.query.page) !== 'undefined' ? Number(req.query.page) : 0;
     let query = "SELECT * FROM transactions ORDER BY id DESC LIMIT ? OFFSET ?";
-    global.mysql.query(query, [limit, page]).then(function (rows) {
+    global.mysql.query(query, [limit, page * limit]).then(function (rows) {
         if (rows.length === 0) {
             return res.json([]);
         }
@@ -514,7 +514,7 @@ app.get('/miner/:address/payments', function (req, res) {
             "payments WHERE payment_address = ? AND payment_id IS ? ORDER BY paid_time DESC LIMIT ? OFFSET ?";
     }
     let response = [];
-    global.mysql.query(query, [address, payment_id, limit, page]).then(function (rows) {
+    global.mysql.query(query, [address, payment_id, limit, page * limit]).then(function (rows) {
         if (rows.length === 0) {
             return res.json(response);
         }