Multisig burn() call doesn't remove deleted IPF from IPS

[jakerumbles]

Basically when you use the operateMultisig to burn an IPF that is owned and appended to that IPS, it burns the IPF, but doesn't remove it from the IPS. On the very bottom is the IPF I just burned (IpfId 0), but you can see that the IPS still thinks it has IPF 0. Seems to me that this should be in sync. If the multisig votes to burn an IPF, then the IPS shouldn't show it still has the file as the hash has been deleted from the chain. That just doesn't make sense I think