[joss] fix incomplete attribute selectors in keyboard shortcuts #27
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Part of: openjournals/joss-reviews#6336
The keyboard shortcuts currently use incomplete attribute selectors, eg.
querySelector('[title="Select"')
These work, but they shouldn't since i think all levels of the CSS spec say browsers should ignore invalid selectors.
In any case, my linter is yelling at these being incomplete, so here's a function-neutral PR to make it be quiet.