Delete image doesn't delete local image

[leohubert]

When we delete picture it will not be deleted from disk.

[tzkmx]

Just like the issue #12 the first trouble is that is not taking into account the disk, that can be remote or local, to get to the location onto which the file was saved.

However, the Vue component is sending to the API the original filename, not the path where the upload put the file. This way the call to delete, without the disk and without the path is actually useless and deleting it from the field should not be applied.

I've just sent a PR to fix this: #15 hopefully somebody else can benefit of this.