resources: Consolidate on the WikimediaUI “erroneous” color value
“Erroneous” color was updated to `#d33` in WikimediaUI color palette to
ensure WCAG 2.0 level AA conformance with both white and black.
Replacing all occurences of `#f00` and `#c00` to reflect color palette
change with the following caveats and exceptions:
- MW config styles are not amended, as it is out of scope and all
boundaries and applications of WikimediaUI are yet to be defined;
- oldshared.css is excluded, as WikimediaUI isn't touching old skins; &
- errorbox with its current background is getting a lowered textual
contrast but we still provide enough contrast for text size and bolded
font, and this needs to be seen as intermediate standardization step.
Bug: T152025
Change-Id: Iba3362abaa1702599f0d68860f579aea2114801c