Align the svg drawing area, svgcanvas, inside the svg editor workspace.

[#54482200]
remove image snapshot from svg edit dialog
Make sure input field containing svg annotation is updated before form submit
Allow for multiple svg_edits in one page.
Support multiple SVG EDIT canvases.
Gemfile, lock SHA for CC Sketchily.
Add button 'Edit Answer' near 'Replace Snapshot' 
[#54716124]

https://www.pivotaltracker.com/story/show/54716124
remove commented-out code