refactor: small improvements and clean up (#3423)

* refactor: replace custom map functions with slice.Map

* refactor: extract StringerValue function

* refactor: removed unnecessary if

* chore: removed invalid comment

* refactor: replace more map functions

* chore: fix FFmpeg typo

server/server.go

@@ -40,7 +40,7 @@ func New(ds model.DataStore, broker events.Broker) *Server {
 	s.initRoutes()
 	s.mountAuthenticationRoutes()
 	s.mountRootRedirector()
-	checkFfmpegInstallation()
+	checkFFmpegInstallation()
 	checkExternalCredentials()
 	return s
 }