lvfontbin behaves different as .mpy and .py

```
Adafruit CircuitPython 10.0.0-alpha.7-5-g203c9990e6-dirty on 2025-06-25; Adafruit Fruit Jam with rp2350b
```

With this code:
```
import gc

from displayio import Group, TileGrid, Palette
from terminalio import Terminal, FONT

from adafruit_bitmap_font import bitmap_font
import supervisor

main_group = Group()
display = supervisor.runtime.display
display.root_group = main_group

print(f"free: {gc.mem_free()}")
# font = FONT
font = bitmap_font.load_font("fonts/terminal.lvfontbin")
char_size = font.get_bounding_box()
print(f"char_size: {char_size}")
screen_size = (display.width // char_size[0], display.height // char_size[1])

terminal_palette = Palette(2)
terminal_palette[0] = 0x000000
terminal_palette[1] = 0xffffff

terminal_area = TileGrid(bitmap=font.bitmap, width=screen_size[0], height=screen_size[1],
tile_width=char_size[0], tile_height=char_size[1], pixel_shader=terminal_palette)

main_group.append(terminal_area)
terminal = Terminal(terminal_area, font)

message = f"Hello World"
terminal.write(message)

while True:
pass
```

when `adafruit_bitmap_font` is mpy files:
```
code.py output:
free: 8262784
Traceback (most recent call last):
File "code.py", line 15, in
File "adafruit_bitmap_font/bitmap_font.py", line 71, in load_font
File "adafruit_bitmap_font/lvfontbin.py", line 77, in __init__
MemoryError: memory allocation failed, allocating 28161 bytes
```

and when `adafruit_bitmap_font` is py files instead:
```
code.py output:
free: 8262768
char_size: (0, 16, 0, -4)
Traceback (most recent call last):
File "code.py", line 18, in
ZeroDivisionError: division by zero
```

The divide by zero error I think is unrelated to the difference in behavior between mpy and py, it seems to be due to lvfont having different values for bounding box than the code I am using had expected.

This issue is specifically for the fact that `load_font()` raises memory error when run as .mpy files but suceeds when run as .py files.