Re: [manifest] Add icons_background_color instead of background_color (#387)

I agree that a background colour per icon is probably excessive, but I'm not sure I understand the difference between "theme_color" and "icons_background_color" after this change.

I think the "mask icon" debacle at WHATWG over Apple's (mis-)use of theme_color has shown that people generally consider "theme_color" as a background colour even though it isn't explicitly specified this way. Perhaps this spec should explicitly use "theme_color" as background colour, or just use "background_color" instead. "theme_color" would be more consistent with HTML.

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