Removing sponsors code.

Support new sponsor confirmation polling.
fixes #319

frontend/src/app/interfaces/websocket.interface.ts

@@ -15,13 +15,11 @@ export interface WebsocketResponse {
   tx?: Transaction;
   rbfTransaction?: Transaction;
   transactions?: TransactionStripped[];
-  donationConfirmed?: boolean;
   loadingIndicators?: ILoadingIndicators;
   'track-tx'?: string;
   'track-address'?: string;
   'track-asset'?: string;
   'watch-mempool'?: boolean;
-  'track-donation'?: string;
 }
 
 export interface MempoolBlock {