Fix graph legend update while load bug and remove unnecessary query

backend/src/api/mining/mining-routes.ts

@@ -227,10 +227,8 @@ class MiningRoutes {
         throw new Error('from must be less than to');
       }
       const blockFees = await mining.$getBlockFeesTimespan(parseInt(req.query.from as string, 10), parseInt(req.query.to as string, 10));
-      const blockCount = await BlocksRepository.$blockCount(null, null);
       res.header('Pragma', 'public');
       res.header('Cache-control', 'public');
-      res.header('X-total-count', blockCount.toString());
       res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
       res.json(blockFees);
     } catch (e) {