OnChain Config change: Gateways, and notification

Changes:
- Remove expired notification
- Add disable reason for OPEN and BRIDGE
- Disable GDEX
- Refresh voting inquiry

```
This asset is used for decentralized configuration of the BitShares UI placed under bitshares.org.
{
"notifications":[
{
"type":"warning",
"begin_date":"01.12.2019",
"end_date":"31.12.2019",
"content":"Dear BitShares community and BTS holders, please consider to continue your support for the development of this wallet by giving your vote to the BitShares UI worker. For more details have a look at https://news.bitshares.org/bitshares-ui-worker-review!"
}
],
"blacklists":{
"assets":[],
"accounts":[]
},
"gateways":{
"OPEN":{
"enabled": false,
"comment": "OpenLedger Gateway API Integration is defective."
},
"BRIDGE":{
"enabled": false,
"comment": "CryptoBridge is shutting down December 15, 2019. "
},
"GDEX":{
"enabled": false,
"comment": "GDEX requires KYC for certain actions. This not integrated yet."
}
}
}
```