Use standard icon colors so that selected icons are white (#7640)

I changed the colors of the Flutter insets within the SVG files. The
light icons did not change much, because the blue used before was pretty
close to the standard blue.

The dark versions' Flutter insets were previously an aqua shade, and I'm
not sure if it would be better to change to teal or blue. For now I've
chosen teal because it seemed a little brighter, but neither seems
ideal. For reference, the colors are coming from
https://www.figma.com/design/jYJmUxEUdob9FxsCxfRTDb/Int-UI-Kit-(Community)
and we can use the colors that are identified as being for icons.

| Original | Blue | Teal |
|---------|------|----|
|<img width="52" alt="Screenshot 2024-09-06 at 12 59 41 PM"
src="https://github.com/user-attachments/assets/01189a89-5b59-418f-958d-0f88a75c4354">|<img
width="47" alt="Screenshot 2024-09-06 at 1 10 43 PM"
src="https://github.com/user-attachments/assets/15b893d7-fec8-4004-96d1-578e53b7caf9">|<img
width="44" alt="Screenshot 2024-09-06 at 1 00 52 PM"
src="https://github.com/user-attachments/assets/54aa5996-cebd-4320-98c9-5394cf995c25">|
|<img width="46" alt="Screenshot 2024-09-06 at 1 05 11 PM"
src="https://github.com/user-attachments/assets/5ee54e0f-1ed6-4795-92da-998d84d5ae30">|<img
width="39" alt="Screenshot 2024-09-06 at 1 09 08 PM"
src="https://github.com/user-attachments/assets/15851f6b-ce31-4d79-b550-899219beb919">|<img
width="45" alt="Screenshot 2024-09-06 at 1 05 40 PM"
src="https://github.com/user-attachments/assets/e2aeae34-74db-474b-958a-575259023684">

Fixes #7621

Author: helin24