confwatcher: remove redundant code (#2592)

internal/confwatcher/confwatcher.go

@@ -30,14 +30,7 @@ type ConfWatcher struct {
 // New allocates a ConfWatcher.
 func New(confPath string) (*ConfWatcher, error) {
 	if _, err := os.Stat(confPath); err != nil {
-		if confPath == "mediamtx.yml" {
-			confPath = "rtsp-simple-server.yml"
-			if _, err := os.Stat(confPath); err != nil {
-				return nil, err
-			}
-		} else {
-			return nil, err
-		}
+		return nil, err
 	}
 
 	inner, err := fsnotify.NewWatcher()