change(button): primary color is blue and secondary is green

- Alongside the dark and light variants, this way inverted,
  hover and active colors use the proper colors instead of mix
  and match

theme/themes/eea/globals/site.variables

@@ -56,11 +56,11 @@
 @primaryColor         : @darkCerulean;
 @secondaryColor       : @pineGreen;
 
-@lightPrimaryColor    : @darkCyan;
-@lightSecondaryColor  : @mediumPersianBlue;
+@lightPrimaryColor    : @mediumPersianBlue;
+@lightSecondaryColor  : @darkCyan;
 
-@darkPrimaryColor     : @bottleGreen;
-@darkSecondaryColor   : @darkMidnightBlue;
+@darkPrimaryColor     : @darkMidnightBlue;
+@darkSecondaryColor   : @bottleGreen;
 
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