icon offset issue in bottom bar

[a-dekker]

gmenu2x has some offset issues with icons in the bottom bar. It shows in the About page in settings and in explorer mode for example.

You can see an example screenshot here: eduardofilo/RG350_adam_image#349 (comment)

I was able to fix this, but I have no idea if the issue is related to the resolution of the screen and if it will cause side effects on other resolutions and needs to be more dynamic. But it's helps on 640x480 displays.

What I did was change the "y - 7" to "y - 22" over here: https://github.com/OpenDingux/gmenu2x/blame/74321f7a32ad25e96b16b41abdb890f704c3f121/src/gmenu2x.cpp#L1006

Maybe someone can test this on a 320x240 display for example and make a proper fix?

Edit: I will also put my screenshots here.
Before:

After mentioned code change: