[BUGFIX] Added fixed width and height to svg icons within analysis

[RinyVT]

Summary

This PR can be summarized in the following changelog entry:

• There were multiple reports of huge svg icons in the backend because of missing styles, although this should not happen (the style should come from styled-components) this would be a quick fix to avoid this

Relevant technical choices:

• Added width and height of 16px, just like the styles would do

Quality assurance

• I have tested this code to the best of my abilities
• I have added unittests to verify the code works as intended

Fixes #609

[ChristianOsswald]

Works for with TYPO3 13.4.14