Fix embedded SVG fill attribute (#4086)

* Fix embedded SVG fill attribute

SCSS darken/lighten functions may not return a color value, but a color
name like "white".  See following example:

https://www.sassmeister.com/gist/c41da93b87d536890ddf30a1f42e7816

This patch will normalize $color argument to FFFFFF style.

I also changed the function name from "url-friendly-colour" to
"hex-color", Because...

1. The name "url-friendly" is not meaningful enough to describe what it
   does.

2. It is familier to me using "color" rather than "colour"

    kojima:kojiMac mastodon[master]$ git grep -l colour
    app/javascript/styles/boost.scss
    spec/fixtures/files/attachment.jpg

    kojima:kojiMac mastodon[master]$ git grep -l color
    .rspec
    .scss-lint.yml
    Gemfile.lock
    app/javascript/mastodon/features/status/components/action_bar.js
    app/javascript/styles/about.scss
    app/javascript/styles/accounts.scss
    app/javascript/styles/admin.scss
    app/javascript/styles/basics.scss
    app/javascript/styles/boost.scss
    app/javascript/styles/compact_header.scss
    app/javascript/styles/components.scss
    app/javascript/styles/containers.scss
    app/javascript/styles/footer.scss
    app/javascript/styles/forms.scss
    app/javascript/styles/landing_strip.scss
    app/javascript/styles/reset.scss
    app/javascript/styles/stream_entries.scss
    app/javascript/styles/tables.scss
    app/javascript/styles/variables.scss
    app/views/admin/subscriptions/_subscription.html.haml
    app/views/layouts/application.html.haml
    app/views/layouts/error.html.haml
    app/views/manifests/show.json.rabl
    bin/webpack-dev-server
    config/initializers/httplog.rb
    public/500.html
    public/emoji/1f1e6-1f1e8.svg
    public/emoji/1f1ec-1f1f8.svg
    public/emoji/1f1f3-1f1ee.svg
    public/emoji/1f1fb-1f1ec.svg
    spec/fixtures/requests/idn.txt
    yarn.lock

* Add semicolon

1 files changed, 7 insertions, 4 deletions

diff --git a/app/javascript/styles/boost.scss b/app/javascript/styles/boost.scss
index 7589828c6..8d6478e10 100644
--- a/app/javascript/styles/boost.scss
+++ b/app/javascript/styles/boost.scss
@@ -1,11 +1,14 @@
-@function url-friendly-colour($colour) {
-  @return '%23' + str-slice('#{$colour}', 2, -1)
+@function hex-color($color) {
+  @if type-of($color) == 'color' {
+    $color: str-slice(ie-hex-str($color), 4);
+  }
+  @return '%23' + unquote($color)
 }
 
 button.icon-button i.fa-retweet {
-  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='22' height='209'><path d='M4.97 3.16c-.1.03-.17.1-.22.18L.8 8.24c-.2.3.03.78.4.8H3.6v2.68c0 4.26-.55 3.62 3.66 3.62h7.66l-2.3-2.84c-.03-.02-.03-.04-.05-.06H7.27c-.44 0-.72-.3-.72-.72v-2.7h2.5c.37.03.63-.48.4-.77L5.5 3.35c-.12-.17-.34-.25-.53-.2zm12.16.43c-.55-.02-1.32.02-2.4.02H7.1l2.32 2.85.03.06h5.25c.42 0 .72.28.72.72v2.7h-2.5c-.36.02-.56.54-.3.8l3.92 4.9c.18.25.6.25.78 0l3.94-4.9c.26-.28 0-.83-.37-.8H18.4v-2.7c0-3.15.4-3.62-1.25-3.66z' fill='#{url-friendly-colour(lighten($ui-base-color, 26%))}' stroke-width='0'/><path d='M7.78 19.66c-.24.02-.44.25-.44.5v2.46h-.06c-1.08 0-1.86-.03-2.4-.03-1.64 0-1.25.43-1.25 3.65v4.47c0 4.26-.56 3.62 3.65 3.62H8.5l-1.3-1.06c-.1-.08-.18-.2-.2-.3-.02-.17.06-.35.2-.45l1.33-1.1H7.28c-.44 0-.72-.3-.72-.7v-4.48c0-.44.28-.72.72-.72h.06v2.5c0 .38.54.63.82.38l4.9-3.93c.25-.18.25-.6 0-.78l-4.9-3.92c-.1-.1-.24-.14-.38-.12zm9.34 2.93c-.54-.02-1.3.02-2.4.02h-1.25l1.3 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