[FEATURE] add password visibility-timeout setting

[liamtrinalizo]

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Is your feature request related to a problem? Please describe.

The decrypted password will be shown for ~45 seconds before the UI goes automatically back to the password list.

The 45s timeout is too short for me when I'm writing the password to another device (especially for long random auto-generated password)

Describe the solution you'd like

An option could be added in settings to define a custom password timeout

Describe alternatives you've considered

The value of "Password copy timeout" could instead be used as settings for visibility timeout rather than having two settings

Since the setting is called GENERAL_SHOW_TIME it would make sence to combine the two

Additional context

I'm currently using version 1.13.5, and tryed to change "Password copy timeout" to a higher value but password visibility stayed at 45sec

Thanks for the great App BTW.