Contribute back our version of the flag of Iceland

[wyattoday]

See commit 61d1d21

Fix flag of Iceland colors to match Icelandic legislation. Namely "Íslensk lög 20. janúar 2017. Útgáfa 146a." / "Icelandic law, January 20, 2017. Issue 146a.":

https://archive.is/2017.07.01-005022/http://www.althingi.is/lagas/146a/2016032.html#selection-133.0-139.1

PANTONE 287 C, https://www.pantone.com/color-finder/287-C
Hex: #3087

PANTONE 199 C, https://www.pantone.com/color-finder/199-C
Hex: #D50032

Contribute these changes back to https://commons.wikimedia.org/wiki/File:Flag_of_Iceland.svg