Clear specular buffer if sky mode is canvas and screen space effects are used #78624
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Canvas background mode does not clear the color buffer, but copies over it. If screen-space specular effects are enabled and the background is blank, this would result in ghosting due to the separate specular buffer copy. Need to explicitly clear the specular buffer once we're done with it to fix it.
Closes #76044
(Note, this fixes the artifacting when resizing the window mentioned in that issue, too, but only once resizing is stopped. Previously, the flashing and artifacts would remain after resizing was finished. Now at least it's cleared once the window stops moving. Still, this PR does fix the original issue and logically makes sense. That other bug should probably be a separate issue and PR as the cause seems to be different.)