added initial src for the redo/undo images

[svandeneertwegh]

Description

The img tags in template needs a src value to start with. Once it is loaded the css with base64 images kicks in.

Checklist

• [ ] I have opened this pull request against master
• [ ] I have added or modified the tests when changing logic
• [ ] I have followed the conventional commits guidelines to add meaningful information into the changelog
• [ ] I have read the contribution guidelines and I have joined #workgroup-pr-review on Slack to find a “pr review buddy” who is going to review my pull request.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d709b02) 33.24% compared to head (c113891) 33.24%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #50 +/- ## ======================================= Coverage 33.24% 33.24% ======================================= Files 17 17 Lines 728 728 Branches 71 71 ======================================= Hits 242 242 Misses 485 485 Partials 1 1 ```

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