fix backspace not working as a keyboard shortcut #9995
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In many browsers, ⌫ Backspace used to be a shortcut to navigate back to the previous page. Since this was very frustrating, an override was added to block ⌫ Backspace 11 years ago (see #303).
However, this code prevents other iD operations from using ⌫ Backspace as a keyboard shortcut (see #9994).
Luckily, all the major browsers removed the ⌫ Backspace feature (Chrome in 2016[1], Safari in 2019[2], Edge in 2019[3], Firefox in 2021[1]), so we can now remove this override to fix #9994