Remove custom logic for sizing autofill overflow menu popup

[CDRussell]

Task/Issue URL: https://app.asana.com/0/488551667048375/1209252957928805/f

Description

Updates the password management screen so that popup menus (triggered from a password’s overflow menu) take on the default size instead of specifying a custom width.

Steps to test this PR

• On a phone, visit Settings->Passwords, manually add a password, then return to the password list view.
• Tap on the password’s overflow, and verify the sizing of the popup menu looks ok
• Flip to landscape, and check it still looks good.
• As a final check, keep it in landscape and leave the screen. re-enter password management screen and check the overflow size is still good.
• Repeat on a tablet.

[CDRussell]

• Remove custom logic for sizing autofill overflow menu popup #5548 👈 (View in Graphite)
• develop

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[anikiki]

Looks good and works as expected! 🎉