Apply prefer-const lint rule

lib/session.js

@@ -412,7 +412,7 @@ function revertDownloadParameters(sessionContext, instance, callback) {
       "Download"
     ]);
 
-    let toClear = device.set(sessionContext.deviceData, p, timestamp, {
+    const toClear = device.set(sessionContext.deviceData, p, timestamp, {
       value: [
         timestamp,
         [
@@ -2080,7 +2080,7 @@ function loadPath(sessionContext, path, depth) {
   if (trimWildcard < path.length) path = path.slice(0, trimWildcard);
 
   for (let i = 0; i <= path.length; ++i) {
-    let d = i === path.length ? 99 : i;
+    const d = i === path.length ? 99 : i;
     for (const sup of sessionContext.deviceData.paths.find(
       path.slice(0, i),
       true,