avalanche: add mainnet offline-prune config matching fuji pattern

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

avalanche/mainnet/prune/C/config.json

@@ -1,23 +1,6 @@
 {
-    "snowman-api-enabled": false,
-    "coreth-admin-api-enabled": false,
-    "net-api-enabled": true,
     "rpc-gas-cap": 2500000000,
-    "rpc-tx-fee-cap": 100,
     "eth-rpc-gas-limit": 2500000000,
-    "eth-api-enabled": true,
-    "personal-api-enabled": false,
-    "tx-pool-api-enabled": false,
-    "debug-api-enabled": false,
-    "web3-api-enabled": true,
-    "local-txs-enabled": false,
-    "pruning-enabled": true,
-    "api-max-duration": 0,
-    "api-max-blocks-per-request": 0,
-    "allow-unfinalized-queries": false,
-    "log-level": "info",
-    "state-sync-enabled": false,
-    "state-sync-skip-resume": true,
     "offline-pruning-enabled": true,
     "offline-pruning-data-directory": "/root/.avalanchego/offline-pruning"
 }