fix: remove btc activation height as it could be 0 (#87)

internal/clients/bbnclient/bbnclient.go

@@ -94,10 +94,6 @@ func (c *BBNClient) GetAllStakingParams(ctx context.Context) (map[uint32]*Stakin
 		if err := params.Params.Validate(); err != nil {
 			return nil, fmt.Errorf("failed to validate staking params for version %d: %w", version, err)
 		}
-		// BBN is missing the btcActivationHeight validation in the staking params
-		if params.Params.BtcActivationHeight == 0 {
-			return nil, fmt.Errorf("btc activation height is not set")
-		}
 
 		allParams[version] = FromBbnStakingParams(params.Params)
 		version++