Add support for SVG to image referece in SVG encoded as a data URI (SVG data loader)

[scuba1012002]

In the file from the asciidoctor-pdf repo
lib/asciidoctor/pdf/ext/prawn-svg/loaders/data.rb it was advised to remove the
regex
REGEXP = %r(\Adata:image/(?:png|jpe?g);base64(?:;[a-z0-9]+)*,)i
restriction now that prawn-svg supports SVG image references in SVG

Regex from prawn:
REGEXP = %r{\Adata:image/(png|jpeg|svg\+xml);base64(;[a-z0-9]+)*,}i

[mojavelinux]

This is related to prawn-svg upgrade in 2.3.14.