fix: logfiles endpoint missing authentication

The skServer/logfiles was not protected by admin authentication
as a result of an earlier server API paths reorganisation. This
fix adds authentication to the correct path so that log files
are now protected.

src/interfaces/logfiles.js

@@ -29,7 +29,7 @@ module.exports = function (app) {
 }
 
 function mountApi(app) {
-  app.securityStrategy.addAdminMiddleware('/logfiles')
+  app.securityStrategy.addAdminMiddleware(`${SERVERROUTESPREFIX}/logfiles/`)
   app.get(`${SERVERROUTESPREFIX}/logfiles/`, function (req, res) {
     listLogFiles(app, (err, files) => {
       if (err) {