Remove 'no cache' directive for POST requests

The response for POST request is only cachable under a specific condition and
qbt doesn't use it.
https://developer.mozilla.org/en-US/docs/Glossary/Cacheable

src/webui/www/private/scripts/prop-files.js

@@ -358,8 +358,8 @@ window.qBittorrent.PropFiles = (function() {
         const url = new URI('api/v2/torrents/files?hash=' + current_hash);
         new Request.JSON({
             url: url,
-            noCache: true,
             method: 'get',
+            noCache: true,
             onComplete: function() {
                 clearTimeout(loadTorrentFilesDataTimer);
                 loadTorrentFilesDataTimer = loadTorrentFilesData.delay(5000);