Fixed bug with svg images, IE11

[Blackbaud-SteveBrush]

Addresses: #1130

[codecov-io]

Codecov Report

Merging #1190 into master will not change coverage.
The diff coverage is n/a.

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  Coverage     100%    100%           
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  Files         355     355           
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  Branches      853     853           
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  Hits         6622    6622

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[Blackbaud-BobbyEarl]

This does seem to fix the problem @Blackbaud-SteveBrush. Is it weird we're using a different format for those now?

[Blackbaud-SteveBrush]

@Blackbaud-BobbyEarl The only difference is that I didn't base64 encode the svg's contents. I'm getting the source files from Steglin and will see if I can recompile them if the inconsistency isn't appropriate.

[Blackbaud-BobbyEarl]

If feasible, I would vote to have them continue to use the same format.