Incorrect use of xmlns "xlink" in img tag

[liamwhite]

Was curious why some user avatars were not rendering. That might be intentional, but this definitely isn't:

philomena/lib/philomena_web/views/user_attribution_view.ex

Lines 45 to 51 in a2e79c8

	def anonymous_avatar(_name, class \\ "avatar--100px") do
	class = Enum.join(["image-constrained", class], " ")
	content_tag :div, class: class do
	raw("<img xlink:href=\"/images/no_avatar.svg\" src=\"/images/no_avatar.svg\">")
	end
	end