review parsedContentLength

Co-authored-by: William <91462779+williamlardier@users.noreply.github.com>

Author: BourgoisMickael

lib/routes/routeBackbeat.js

@@ -1463,9 +1463,7 @@ function routeBackbeat(clientIP, request, response, log) {
     // Attach the apiMethod method to the request, so it can used by monitoring in the server
     // eslint-disable-next-line no-param-reassign
     request.apiMethod = 'routeBackbeat';
-    const contentLength = request.headers['x-amz-decoded-content-length'] ?
-        request.headers['x-amz-decoded-content-length'] :
-        request.headers['content-length'];
+    const contentLength = request.headers['x-amz-decoded-content-length'] || request.headers['content-length'];
     // eslint-disable-next-line no-param-reassign
     request.parsedContentLength = Number.parseInt(contentLength?.toString() ?? '', 10);
     log.addDefaultFields({