Let is work without WiFi and via Ethernet

[To0wnn]

Hi,

I wanted to make it work for an RPi2b I had laying around and its only having a ethernet port.
So a changed the following code to bypass the WiFi Check in Bjorn.py:

#    def is_wifi_connected(self):
#        """Checks for Wi-Fi connectivity using the nmcli command."""
#        result = subprocess.Popen(['nmcli', '-t', '-f', 'active', 'dev', 'wifi'], stdout=subprocess.PIPE, text=True).c>#        self.wifi_connected = 'yes' in result
#        return self.wifi_connected

    def is_wifi_connected(self):
        """Always returns True for Wi-Fi connectivity."""
        self.wifi_connected = True
        return self.wifi_connected