Update GuiEye.java

mc.renderEngine.bindTexture methods have obfuscated names in earlier versions of Forge. Update to the latest version to use these.

mc.renderEngine = mc.func_110434_K()
renderEngine.bindTexutre = renderEngine.func_110577_a()
I18n.func_135053_a is now I18n.getString

Gui Texture file should be updated as well to provide brackets to render around active slot.