Apply prefer-const lint rule

lib/nbi.js

@@ -592,7 +592,7 @@ function listener(request, response) {
       let projection = null;
       if (urlParts.query.projection) {
         projection = {};
-        for (let p of urlParts.query.projection.split(","))
+        for (const p of urlParts.query.projection.split(","))
           projection[p.trim()] = 1;
       }
 
@@ -601,7 +601,7 @@ function listener(request, response) {
       if (urlParts.query.sort) {
         const s = JSON.parse(urlParts.query.sort);
         const sort = {};
-        for (let [k, v] of Object.entries(s)) {
+        for (const [k, v] of Object.entries(s)) {
           if (k[k.lastIndexOf(".") + 1] !== "_" && collectionName === "devices")
             sort[`${k}._value`] = v;
           else sort[k] = v;