Fixes case-sensitivity and residual keys in date-keybinds

[Vigasaurus]

Changes

• Fixes Keyboard shortcuts: cmd does not seem to be ignored correctly #707
• Ensures that keys pressed with a capitalization modifier are properly handled

Tests

• This PR does not require tests

Changelog

• Entry has been added to changelog
  With 1.2 now released, I'm unsure where you want changelog updates/the new version you're targeting

Documentation

• This change does not need a documentation update

[ukutaht]

Awesome @Vigasaurus I can confirm my issue with cmd+w is fixed on your testing box.

I've updated the CHANGELOG.md on master. You can add this under 1.3 - unreleased.

I did notice some weirdness. On current master, shift+w doesn't do anything. With this PR hitting shift+w seems to clear the period query param. I would expect it to either do nothing or navigate to ?period=7d. Is this intentional or just happening on my machine?

[Vigasaurus]

Hmm that seems backwards in respect to the issue, to me.

On the current master pressing shift+<any accepted key> would reset the period and date params, which was one of the bugs this was fixing.

In this PR, pressing shift+<any accepted> should do the same as the non-shift version of the key (and it behaves correctly like this for me). And in this PR, if the period is already set to the one corresponding to the key pressed, the period is left unchanged, but the date, to and from params are reset to being unset.

If you're having issues with the shift+key resetting the period, I'd have to assume that something's up with your webpack or caching; I just tried on a fresh pull and its seemingly working as described above.

[ukutaht]

You're correct. I must have mixed up my testing environments or something. Thanks for the contribution!