Fix #3612 (opaque fills on top of transparent fills not rendering correctly) #3628
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This fixes #3612 which was introduced in 10d98cf#diff-6709b06e8fd7021244319a5b88e5308fL106 — we lost a gl state call to re-enable depth testing after being disabled in symbol rendering.
Regression test added in mapbox/mapbox-gl-test-suite#171.
cc @lucaswoj