Remove aria-pressed where it's redundant (#19912)

This commit removes aria-pressed attribute from all elements which
contents or other descriptive attributes change in active state,
effectively replacing the meaning of the button, in which case
aria-pressed, an attribute specified whether the button is currently
pressed, would create a confusion. (Spoiler: it's everywhere).

See https://github.com/mastodon/mastodon/issues/13545#issuecomment-1304886969

app/javascript/mastodon/components/column_header.js

@@ -152,7 +152,6 @@ class ColumnHeader extends React.PureComponent {
           className={collapsibleButtonClassName}
           title={formatMessage(collapsed ? messages.show : messages.hide)}
           aria-label={formatMessage(collapsed ? messages.show : messages.hide)}
-          aria-pressed={collapsed ? 'false' : 'true'}
           onClick={this.handleToggleClick}
         >
           <i className='icon-with-badge'>