Example: Don't load texture removed from source tree

Fixes: c3b948b1 ("Replaced skybox HDR image")

examples/models/models_material_pbr.c

@@ -152,7 +152,7 @@ static Material LoadMaterialPBR(Color albedo, float metalness, float roughness)
     SetShaderValuei(shdrIrradiance, GetShaderLocation(shdrIrradiance, "environmentMap"), (int[1]){ 0 }, 1);
     SetShaderValuei(shdrPrefilter, GetShaderLocation(shdrPrefilter, "environmentMap"), (int[1]){ 0 }, 1);
 
-    Texture2D texHDR = LoadTexture("resources/pinetree.hdr");
+    Texture2D texHDR = LoadTexture("resources/dresden_square.hdr");
     Texture2D cubemap = GenTextureCubemap(shdrCubemap, texHDR, CUBEMAP_SIZE);
     mat.maps[MAP_IRRADIANCE].texture = GenTextureIrradiance(shdrIrradiance, cubemap, IRRADIANCE_SIZE);
     mat.maps[MAP_PREFILTER].texture = GenTexturePrefilter(shdrPrefilter, cubemap, PREFILTERED_SIZE);
@@ -193,4 +193,4 @@ static Material LoadMaterialPBR(Color albedo, float metalness, float roughness)
     mat.maps[MAP_HEIGHT].value = 0.5f;
 
     return mat;
-}
+}