feat(statics): enable CoinFeature.STAKING for mainnet xdc coin

The STAKING feature was previously added only to txdc (testnet) in
PR #8247, with mainnet xdc intentionally left out pending go-live.
Prod flipt flags are now enabled — this unblocks staking visibility
in the production UI.

Ticket: SI-237

Author: Doddanna17

modules/statics/src/allCoinsAndTokens.ts

@@ -1560,7 +1560,7 @@ export const allCoinsAndTokens = [
     18,
     UnderlyingAsset.XDC,
     BaseUnit.ETH,
-    XDC_FEATURES
+    [...XDC_FEATURES, CoinFeature.STAKING]
   ),
   account(
     'e6ecb22e-0ae8-463a-b2fb-61502fd54240',