Fix Exit this Page indicator colours not being suitable for hover/focus #3247
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Removes the background-color from the indicator dot container, as we want it to use whatever the button background colour is, including when hovering or focused.
Changes the indicator dots to use
inherit
/currentcolor
so that the dots remain visible on the button's focus state. Still maintains the explicit colour definitions for IE8 as it doesn't support thecurrentcolor
keyword.Fixes #3246.