Revert "Workaround X BadMatch crash (bgo#641515)"
Revert "Workaround X BadMatch crash (bgo#641515)"

This reverts commit 88604c9667512f43edce9abcf08fd4a096917b3d.

Bertrand discovered that since we now lazy-load the Wikipedia webkit
view this bug seems to be gone, and we can revert the workaround so that
the notification area icon has a transparent bg again.

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