HTML Validation: Personal settings

[ShGKme]

• Resolves: A part of https://github.com/nextcloud/andy/issues/5

Summary

This PR fixes a number of small HTML validation issues on the Personal settings page.

See by commits.

Error: Bad value for attribute aria-describedby on element input: An IDREFS value must contain at least one non-whitespace character.

fix(settings): remove empty aria-describedby
Empty string '' was set when there is no ID. But empty string is still rendered in Vue and is not a valid ID. Replaced with undefiend.

No visual changes.

Before:

After:

Error: The value of the for attribute of the label element must be the ID of a non-hidden form control.

fix(settings): fix ids and aria-labels in personal emails

Email elements had different ways to assign IDs and additional emails had no labels at all.

Now it is passed the same way as in other sections.

Error: Attribute disabled-menu not allowed on element div at this point.

fix(settings): remove invalid avatar prop
There was a typo, it must have been disable-menu, not disableD-menu.
But it is not required because the menu is disabled for the current user anyway.

No visual changes:

Error: Attribute disabled-tooltip not allowed on element div at this point.

fix(settings): typo in avatar prop
disabled-tooltip -> disable-tooltip

Error: Attribute placeholder not allowed on element select at this point.

fix(settings): remove placeholder from select.

<select> doesn't support placeholder in HTML

No visual changes:

Error: Attribute handle-scope-change not allowed on element div at this point.

fix(settings): remove unused savePrimaryEmailScope on Personal Settings page

If was replaced with universal savePrimaryAccountPropertyScope before already. This method was unused and <HeaderBar> has no handle-scope-change prop.

Just removed.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)