[whatwg/dom] Handle old value correctly when changing an attribute. (PR #1209)

This fixes an error just introduced in
3fb0aa62a96f0b3a8afb016ca95a805ccd3fc5b0; I happened to be reading the text today while working on something else.

cc @josepharhar 
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1209

-- Commit Summary --

  * Handle old value correctly when changing an attribute.

-- File Changes --

    M dom.bs (4)

-- Patch Links --

https://github.com/whatwg/dom/pull/1209.patch
https://github.com/whatwg/dom/pull/1209.diff

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