The commit updates all 276 icons to remove (hopefully) all color-bleeding
artifacts, both at the outer edges and inside. This was achieved by squaring
all the icons, overlapping the shapes where needed, and finally applying a
circular mask to all files using a custom script.
`EA` covers both Ceuta and Melilla; the Ceuta-specific code is `ES-CE`.
This is also consistent with other flags for subdivisions of Spain,
in particular Melilla, which already uses `ES-MA`.
