[core] Remove redundant setDebug() from Painter

This information can be obtained directly from MapData.

src/mbgl/map/map_context.cpp

@@ -248,7 +248,6 @@ bool MapContext::renderSync(const TransformState& state, const FrameData& frame)
         painter->setup();
     }
 
-    painter->setDebug(data.getDebug());
     painter->render(*style, transformState, frame, data.getAnimationTime());
 
     if (data.mode == MapMode::Still) {

src/mbgl/renderer/painter.cpp

@@ -113,10 +113,6 @@ void Painter::resize() {
     }
 }
 
-void Painter::setDebug(bool enabled) {
-    debug = enabled;
-}
-
 void Painter::useProgram(GLuint program) {
     if (gl_program != program) {
         MBGL_CHECK_ERROR(glUseProgram(program));

src/mbgl/renderer/painter.hpp

@@ -120,9 +120,6 @@ public:
     // Adjusts the dimensions of the OpenGL viewport
     void resize();
 
-    // Changes whether debug information is drawn onto the map
-    void setDebug(bool enabled);
-
     void drawClippingMasks(const std::set<Source*>&);
     void drawClippingMask(const mat4& matrix, const ClipID& clip);
 
@@ -189,7 +186,6 @@ private:
     TransformState state;
     FrameData frame;
 
-    bool debug = false;
     int indent = 0;
 
     gl::Config config;

src/mbgl/renderer/painter_debug.cpp

@@ -12,7 +12,7 @@ using namespace mbgl;
 void Painter::renderTileDebug(const Tile& tile) {
     MBGL_DEBUG_GROUP(std::string { "debug " } + std::string(tile.id));
     assert(tile.data);
-    if (debug) {
+    if (data.getDebug()) {
         prepareTile(tile);
         renderDebugText(tile.data->debugBucket, tile.matrix);
         renderDebugFrame(tile.matrix);