Fix mods when elem as string given

[skad0]

{
    block: 'block',
    elem: 'elem',
    mods: {
        m1: 'v1'
    }
 }

should normalized as

[
    { entity: { block: 'block', elem: 'elem' }, tech: undefined },
    { entity: { block: 'block', elem: 'elem', modName: 'm1', modVal: true }, tech: undefined },
    { entity: { block: 'block', elem: 'elem', modName: 'm1', modVal: 'v1' }, tech: undefined }
]

instead of

[
    { entity: { block: 'block', elem: 'elem' }, tech: undefined },
    { entity: { block: 'block', modName: 'm1', modVal: true }, tech: undefined },
    { entity: { block: 'block', modName: 'm1', modVal: 'v1' }, tech: undefined }
]

[qfox]

/ok