fix layer minZoom being ignored if not less than source maxZoom

This condition led to layers with high minzoom like oneway street
arrows (z15) get parsed and placed regardless of minzoom (e.g. z11+),
wasting a lot of worker CPU time.

It became unnecessary after we added reparsing tiles when overscaling,
and even before that it should have probably been <= rather than <.

src/mbgl/map/live_tile_data.cpp

@@ -20,7 +20,6 @@ LiveTileData::LiveTileData(const TileID& id_,
       worker(style_.workers),
       tileWorker(id_,
                  source_.source_id,
-                 source_.max_zoom,
                  style_,
                  style_.layers,
                  state,

src/mbgl/map/tile_worker.cpp

@@ -14,7 +14,6 @@ using namespace mbgl;
 
 TileWorker::TileWorker(TileID id_,
                        std::string sourceID_,
-                       const uint16_t maxZoom_,
                        Style& style_,
                        std::vector<util::ptr<StyleLayer>> layers_,
                        const std::atomic<TileData::State>& state_,
@@ -22,7 +21,6 @@ TileWorker::TileWorker(TileID id_,
     : layers(std::move(layers_)),
       id(id_),
       sourceID(sourceID_),
-      maxZoom(maxZoom_),
       style(style_),
       state(state_),
       collisionTile(std::move(collision_)) {
@@ -120,7 +118,7 @@ void TileWorker::parseLayer(const StyleLayer& layer, const GeometryTile& geometr
     // Skip this bucket if we are to not render this
     if (styleBucket.source != sourceID)
         return;
-    if (id.z < std::floor(styleBucket.min_zoom) && std::floor(styleBucket.min_zoom) < maxZoom)
+    if (id.z < std::floor(styleBucket.min_zoom))
         return;
     if (id.z >= std::ceil(styleBucket.max_zoom))
         return;

src/mbgl/map/tile_worker.hpp

@@ -31,7 +31,6 @@ class TileWorker : public util::noncopyable {
 public:
     TileWorker(TileID,
                std::string sourceID,
-               uint16_t maxZoom,
                Style&,
                std::vector<util::ptr<StyleLayer>>,
                const std::atomic<TileData::State>&,
@@ -58,7 +57,6 @@ private:
 
     const TileID id;
     const std::string sourceID;
-    const uint16_t maxZoom;
 
     Style& style;
     const std::atomic<TileData::State>& state;

src/mbgl/map/vector_tile_data.cpp

@@ -22,7 +22,6 @@ VectorTileData::VectorTileData(const TileID& id_,
       worker(style_.workers),
       tileWorker(id_,
                  source_.source_id,
-                 source_.max_zoom,
                  style_,
                  style_.layers,
                  state,