Minor design issues with browser sessions and device passwords

[ChristophWurst]

Just updated my private installation to beta2 and notice some minor design issues on the personal settings page:

• multiple popover menu of sessions/passwords can be opened (they should close if I click somewhere outside the menu, there's a OC.registerMenu helper or similar)
• the popover's arrow is not aligned to the three dots, it's too much on the right

cc @icewind1991 @nextcloud/designers

[MorrisJobke]

Similar to #2329

[MorrisJobke]

Similar to #2329

Fixed with #2363 by @blizzz

[phsc84]

Also similar to nextcloud/calendar#212