Fix Skyboxes;

src/graphics/graphics.c

@@ -764,7 +764,6 @@ void lovrGraphicsSphere(Texture* texture, mat4 transform, int segments) {
 }
 
 void lovrGraphicsSkybox(Skybox* skybox, float angle, float ax, float ay, float az) {
-  lovrGraphicsPrepare();
   lovrGraphicsPush();
   lovrGraphicsOrigin();
   lovrGraphicsRotate(angle, ax, ay, az);

src/graphics/shader.c

@@ -182,6 +182,7 @@ Shader* lovrShaderCreate(const char* vertexSource, const char* fragmentSource) {
   shader->color = (Color) { 0, 0, 0, 0 };
 
   // Send initial uniform values to shader
+  lovrGraphicsSetShader(shader);
   lovrShaderBind(shader, shader->transform, shader->projection, shader->color, 1);
 
   return shader;