[cairo-meta-surface] Save and restore the original clip.

When replaying the meta-surface to the target, we apply a stack-based
clip to the surface. However, we did not remove this clip from the
surface and so a pointer into our stack existed beyond the scope of
function.

Saving the original clip pointer and restoring it before leaving the
function resolves the issue and appears to fix
https://bugzilla.mozilla.org/show_bug.cgi?id=429071.

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