Issue with creating proposals

[grctest]

When I try to create a proposal, an invalid fee asset id is created which causes an error:

get_required_fees api error: execution error: parse error: couldn't parse uint64_t

I believe this line is the source of the issue: https://github.com/bitshares/bitsharesjs/blob/develop/lib/chain/src/TransactionBuilder.js#L431

            if (isProposal(op)) {
                op[1].proposed_ops.forEach(proposal => {
                    proposed_ops.push(proposal);
                    if (
                        proposalFeeAssets.indexOf(
                            proposal.op[1].fee.asset_id
                        ) === -1
                    )
                        proposalFeeAssets.push(
                            "1.3." + proposal.op[1].fee.asset_id
                        );
                });
            }

So, if the operation is a proposal, the idea is that we go through each proposed operation to make sure we're accounting for the use of different fee assets.

Only the line proposalFeeAssets.push("1.3." + proposal.op[1].fee.asset_id); shouldn't have the preceeding "1.3." + because the proposal op fee asset_id is already using the "1.3.x" asset id format. As this is the case, it tries to look up the fees for "1.3.1.3.0" which is an invalid asset id.

I removed this line and the uncaught error was bypassed, so we should probably change the code to something like the following:

            if (isProposal(op)) {
                op[1].proposed_ops.forEach(proposal => {
                    proposed_ops.push(proposal);
                    if (
                        proposalFeeAssets.indexOf(
                            proposal.op[1].fee.asset_id
                        ) === -1
                    )
                        proposalFeeAssets.push(proposal.op[1].fee.asset_id);
                });
            }