Keyboard shortcuts page is broken if closed with a backward shortcut

[nif-tutao]

• This is not a feature request (existing functionality does not work, not missing functionality).
• I've searched and did not find a similar issue.

Describe the bug
if a user opens keyboard shortcuts dialog by clicking on the Show help button -> Keyboard shortcuts on Premium or just Show help button on the free account and then closes it with a backward shortcut (ALT + <--), and tries to open the same window again, it won't open at all. However, if this dialog is closed by clicking on the Close button, it can still be opened later by clicking on the Show help button -> Keyboard shortcuts on premium or just Show help button on the free account without any problems.

To Reproduce
Steps to reproduce the behavior:

1. Login into any account (Desktop or Web)
2. Click on Show help button then on Keyboard shortcuts on premium or just Show help button on the free account
3. Once the dialog is loaded, close it with a backward shortcut (ALT + <--)
4. Try to open the Keyboard shortcut dialog again
5. See that despite of clicking on the Show help button then on Keyboard shortcuts nothing opens.

Expected behavior
No matter how a user closes the shortcuts dialog, via clicking on the Close button or using a backward shortcut, the dialog can be reopened later without having to restart the client.

Desktop

• OS: Ubuntu 22.04 LTS
• Desktop Environment: Gnome
• Version of the mail client: 3.98.20

Additional information
This bug can be reproduced in the client and web version of Tutanota

Test Notes

Test on Firefox and Chromium

• The keyboard shortcuts dialog can be reopened after closing it with alt + ←
• The keyboard shortcuts dialog can be reopened after closing it with the back button on the browser