Fix wrong palette being used when switching to animated blitter.

Fixes black sprites and UI elements when switching on full
animations on win32 and OSX.

src/blitter/32bpp_anim.hpp

@@ -31,7 +31,9 @@ public:
 		anim_buf_width(0),
 		anim_buf_pitch(0),
 		anim_buf_height(0)
-	{}
+	{
+		this->palette = _cur_palette;
+	}
 
 	~Blitter_32bppAnim();