progs/demos: fix glut initialization calls

Remove glutInitWindowPosition() calls to play nicer with window managers.

Move glutInitWindowSize() calls before glutInit() so the the default window
size can be overridden by the -geometry cmd line option.

progs/demos/engine.c

@@ -1308,8 +1308,8 @@ Init(void)
 int
 main(int argc, char *argv[])
 {
-   glutInit(&argc, argv);
    glutInitWindowSize(WinWidth, WinHeight);
+   glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("OpenGL Engine Demo");
    glewInit();