Dataset resource icons are missing
On dataset pages, some resource icons are strange. It also looks like there are some other styling issues as well.
How to reproduce
Description of steps to reproduce the issue.
- Visit a dataset page
Expected behavior
Pretty and nice resource icons:

Actual behavior
Not nice resource icons:

Sketch
[Notes or a checklist reflecting our understanding of the selected approach]
See example here: https://catalog.data.gov/dataset/directional-wave-and-sea-surface-temperature-measurements-collected-in-situ-by-datawell-d-26-4042
I believe this is resolved. @GSA/data-gov-team Can someone else make sure I'm not crazy for thinking this is no longer an issue?

Not resolved. See the example in @jbrown-xentity comments, and see this one. The icon size is not consistent.
Removing the overrides in datagovtheme allows CKAN core icon to display correctly. @hkdctol do you have reservations with deleting our custom overrides? If not, I'll make this PR production ready.