Standardize naming in colors.xml

As applicable, update the color names to be consistent with those in our Pollo-Android styleguide on Zeplin

Start by locating colors.xml in the Pollo-Android repository and compare its color names with the Pollo-Android styleguide on Zeplin. Review the applicable naming differences and update the names so they are consistent; done means the colors.xml names match the relevant styleguide names.

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