Fixes two silly bugs in the implementation of `<select>` elements.
* We did not fire `input` events
* We fired `change` events *before* updating the selected value
Both of these are only relevant when the embedder selects a value, so
due to our lack of webdriver support we can't test them.
With these changes it is possible to switch the language on
https://toolbox.googleapps.com/apps/main/.
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Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
32cffbc985