[GPIO] Fix mode reported in response to Status command

[dobrykod]

Response to status, mcp, 9 always reports the same "mode": "input":
{
"log": "",
"plugin": 9,
"pin": 9,
"mode": "input",
"state": 1
}

This commit fixes reported mode if the pin is initialized.
Now I see expected response in the widget on http://esp-easy.local/tools and via MQTT:
{
"log": "",
"plugin": 9,
"pin": 9,
"mode": "output",
"state": 1
}

If the pin is not initialized it will print the default "mode": "input" as before.