fix(staking): don't use mainnet in prod yet

apps/staking/src/config/server.ts

@@ -35,8 +35,7 @@ export const WALLETCONNECT_PROJECT_ID = demandInProduction(
   "WALLETCONNECT_PROJECT_ID",
 );
 export const RPC = process.env.RPC;
-export const IS_MAINNET =
-  IS_PRODUCTION_SERVER || process.env.IS_MAINNET !== undefined;
+export const IS_MAINNET = process.env.IS_MAINNET !== undefined;
 export const HERMES_URL =
   process.env.HERMES_URL ??
   (IS_PRODUCTION_SERVER