Fix Bleed regressions (#7705)

I'm still of the opinion that our layout components should have some
defaults and the ones we have on bleed may not be right but we need to
use it in more places to figure out what those defaults should be.

For now, this fixes regressions to Banner that were introduced in
#7644

Author: kyledurand

polaris-react/src/components/Banner/Banner.tsx

@@ -174,7 +174,7 @@ export const Banner = forwardRef<BannerHandles, BannerProps>(function Banner(
           <Icon source={iconName} color={iconColor} />
         </Box>
 
-        <Bleed top="05">
+        <Bleed horizontal="0" top="05">
           {headingMarkup}
           {contentMarkup}
         </Bleed>