Well, that's what happens when you post some useless fake snippet instead of your actual code -- you get answers that aren't relevant to your goal. In this case, the code I posted was specific to the texture file you indicated you were using.
If the texture you
actually want to use fills the entire canvas, just use the code you originally posted, but get rid of the texcoords -- your overlay texture isn't an icon texture, so it shouldn't need to be trimmed like an icon texture. If it doesn't look right, post a screenshot and your
actual code.