shiny/iconvg: regenerate testdata/*.png renderings.

The existing compare-to-golden reference renderings no longer matched
the actual output after the vector renderer changed in
https://golang.org/cl/31532 "vector: change ϕ from 10 to 9".

Change-Id: Iea1980065eee30c3e46927eac7dff65ac2d7c51e
Reviewed-on: https://go-review.googlesource.com/31545
Reviewed-by: Nigel Tao <nigeltao@golang.org>
7 files changed