style: Remove -moz-suppressed.

Per spec we shouldn't behave differently depending on how we blocked the
image/object/etc.

This may have made sense in the past when ad blockers were implemented
via nsIContentPolicy, but I think nowadays it doesn't make sense, and
showing fallback is preferred.

There's a couple extra cleanups we can do after this lands, like
removing HTMLImageElement.imageBlockingStatus and simplifying a bit that
code. But I'll do that in a separate bug.

Differential Revision: https://phabricator.services.mozilla.com/D89912

components/style/gecko/wrapper.rs

@@ -2029,7 +2029,6 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
             NonTSPseudoClass::Invalid |
             NonTSPseudoClass::MozUIValid |
             NonTSPseudoClass::MozBroken |
-            NonTSPseudoClass::MozSuppressed |
             NonTSPseudoClass::MozLoading |
             NonTSPseudoClass::MozHandlerBlocked |
             NonTSPseudoClass::MozHandlerDisabled |