Identify usage of GetBaseFeeV1

[Vvaradinov]

The current param BaseFee defaults to a "version 1" of the parameter if there is no BaseFee set as follows:

// GetBaseFee gets the base fee from the store
func (k Keeper) GetBaseFee(ctx sdk.Context) *big.Int {
	params := k.GetParams(ctx)
	if params.NoBaseFee {
		return nil
	}

	baseFee := params.BaseFee.BigInt()
	if baseFee == nil || baseFee.Sign() == 0 {
		// try v1 format
		return k.GetBaseFeeV1(ctx)
	}
	return baseFee
}

With the migration of params PR can we now safely delete the BaseFeeV1 param?

[github-actions]

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