Move gravity line color updating to gamelogic()

So it doesn't keep updating really quickly.

desktop_version/src/Graphics.cpp

@@ -1447,18 +1447,6 @@ void Graphics::drawtrophytext()
 
 void Graphics::drawentities()
 {
-    //Update line colours!
-    if (linedelay <= 0)
-    {
-        linestate++;
-        if (linestate >= 10) linestate = 0;
-        linedelay = 2;
-    }
-    else
-    {
-        linedelay--;
-    }
-
     point tpoint;
 
     SDL_Rect drawRect;