remove pixi warning

Author: krmbn0576

js/rpg_core/ShaderTilemap.js

@@ -15,7 +15,7 @@ ShaderTilemap.prototype.constructor = ShaderTilemap;
 
 // we need this constant for some platforms (Samsung S4, S5, Tab4, HTC One H8)
 PIXI.glCore.VertexArrayObject.FORCE_NATIVE = true;
-PIXI.GC_MODES.DEFAULT = PIXI.GC_MODES.AUTO;
+PIXI.settings.GC_MODE = PIXI.GC_MODES.AUTO;
 PIXI.tilemap.TileRenderer.SCALE_MODE = PIXI.SCALE_MODES.NEAREST;
 
 /**