Read bootloader config json now returns valid json

[Erol444]

Now bootlaoder_config.py read returns valid json:

{"appMem": -1, "network": {"ipv4": 0, "ipv4Dns": 0, "ipv4DnsAlt": 0, "ipv4Gateway": 0, "ipv4Mask": 0, "ipv6": [0, 0, 0, 0], "ipv6Dns": [0, 0, 0, 0], "ipv6DnsAlt": [0, 0, 0, 0], "ipv6Gateway": [0, 0, 0, 0], "ipv6Prefix": 0, "mac": [0, 0, 0, 0, 0, 0], "staticIpv4": false, "staticIpv6": false, "timeoutMs": 30000}, "usb": {"maxUsbSpeed": 3, "pid": 63036, "timeoutMs": 3000, "vid": 999}}

[themarpe]

Thanks for catching that and the PR!