feat: add `ok_to_mqtt` config

app/src/main/java/com/geeksville/mesh/ui/components/config/LoRaConfigItemList.kt

@@ -199,6 +199,14 @@ fun LoRaConfigItemList(
         }
         item { Divider() }
 
+        item {
+            SwitchPreference(title = "OK to MQTT",
+                checked = loraInput.configOkToMqtt,
+                enabled = enabled,
+                onCheckedChange = { loraInput = loraInput.copy { configOkToMqtt = it } })
+        }
+        item { Divider() }
+
         item {
             PreferenceFooter(
                 enabled = loraInput != loraConfig,