flare: set validate-peers: false (Avalanche C-chain has no EVM peer count)

[artemrootman]

Adds validate-peers: false to the flare chain settings, matching the existing avalanche, aurora, and kite entries.

Flare runs go-flare, an Avalanche/coreth-based node. Peering happens at the Avalanche P2P layer, so the C-chain EVM RPC always returns net_peerCount: 0x0 regardless of how many peers the node actually has. With peer validation enabled, the upstream therefore fails the peer check and is permanently reported as IMMATURE, even when the node is fully bootstrapped and synced.

Observed on a healthy Flare mainnet node:

POST /ext/info    {"method":"info.peers"}     -> {"result":{"numPeers":"166", ...}}   # real Avalanche peers
POST /ext/bc/C/rpc {"method":"net_peerCount"} -> {"result":"0x0"}                     # EVM peer count is always 0

avalanche and kite (also Avalanche C-chains) already carry validate-peers: false for exactly this reason; flare was simply missed.

Validated locally with yamale -s chains.yamale.yaml chains.yaml → success.