gitlab#112 - Apply style attributes for SVG elements

We were applying them only for the toplevel <svg> element; they need
to be applied for all <svg> elements in the drawing.

GNOME/librsvg#112
3 jobs for <span class="ref-name">delayed-svg-attributes</span> in 1 minute and 38 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #9365
fedora:test

00:01:38

 
  Lint
manual #9367
allowed to fail manual
clippy
manual #9366
allowed to fail manual
rustfmt