* Update icon to latest version
* Update brave_toolbar_view.cc
* add a collapsed/expanded state
* Move leo_window_tabs_vertical_expanded to app vector icons
Addresses review: build the expanded vertical-tabs Leo icon from
app/vector_icons (rebased from @brave/leo/icons-skia) instead of
components/vector_icons. Drop redundant components vector_icons include
from brave_toolbar_view; kLeoWindowTabsVerticalExpandedIcon is declared
in brave/app/vector_icons/vector_icons.h.
Made-with: Cursor
* Update BUILD.gn
Agustín Ruiz
c5dbd49570