The Apple Human Interface Guidelines give a specific ordering of the symbols
used as modifier keys in menu shortcuts.  These guidelines are encoded into
the native Cocoa or UIKit menu classes, and are intended to ensure that symbols
are always aligned into columns of like symbols and do not move around in the
case of dynamic menu items (for example, holding Option will transform certain
menu items into different versions that take the Option key, so the Option key
symbol appears to the left of most other symbols to avoid reordering).

The Material spec says to use symbols for modifier keys on Mac and iOS, as this
is what users there are familiar with.  It stands to reason that we should
follow the platform guidelines fully, so this changes the MenuItemButton class
to honor the HIG-compliant symbol ordering on Mac and iOS.

Fixed: #129308