fixed ignore line spacing flag

[ZERICO2005]

bool fontlib_SetFont(const fontlib_font_t *font_data, fontlib_load_options_t flags);
It looks like this code reads from font_data instead of flags. since the low byte of font_data will be non-zero 255/256 times, then I would assume that line spacing will almost always be treated as ignored

[adriweb]

Can we add a test/example for this specifically?

[ZERICO2005]

This is actually a bit worse than I thought. The space above and below will be ignored 99.6% (255/256, the chance that the lower byte of fontlib_font_t *font_data is zero) of the time, so most user code is probably made assuming space_above and space_below are both zero, even though it is not supposed to be