master.py: enforce non-antialised upscaling of trophy icons

Either the default changed in PIL, the mode of the source image was
affected, or something else.

master.py

@@ -228,7 +228,7 @@ def generate_trophy_icons():
                 icon = img.crop((26*x+1, 26*y+1, 26*x+25, 26*y+25))
                 # Skip blank squares in the source image
                 if len(icon.getcolors()) > 1:
-                    yield icon.resize((48,48))
+                    yield icon.resize((48,48), resample=Image.NEAREST)
 
     for (name, icon) in zip(names, trophy_iterator(img)):
         icon.save(os.path.join(dst, f"{name}.png"))