set pack/unpack alignment to 1 in webgl too : prevent error with readPixels on specific texture sizes

h3d/impl/GlDriver.hx

@@ -246,10 +246,10 @@ class GlDriver extends Driver {
 		hxsl.SharedShader.UNROLL_LOOPS = !hasFeature(ShaderModel3);
 		#else
 		gl.enable(GL.TEXTURE_CUBE_MAP_SEAMLESS);
-		gl.pixelStorei(GL.PACK_ALIGNMENT, 1);
-		gl.pixelStorei(GL.UNPACK_ALIGNMENT, 1);
 		gl.finish(); // prevent glError() on first bufferData
 		#end
+		gl.pixelStorei(GL.PACK_ALIGNMENT, 1);
+		gl.pixelStorei(GL.UNPACK_ALIGNMENT, 1);
 	}
 
 	override function setRenderFlag( r : RenderFlag, value : Int ) {