Adjust errorBuilder to trigger on BytesLoader errors

[mnayef95]

Fixing https://github.com/dnfield/vector_graphics/issues/219

[mnayef95]

CC @dnfield

[zanderso]

Hi there, The Flutter team is now maintaining these packages in the flutter/packages repository at packages/vector_graphics and packages/vector_graphics_compiler. We'd appreciate it if you could direct this PR to those locations instead. Thanks!

[erperejildo]

any update on this?

[tperraut]

up