Update Tests/test_image_getbbox.py

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>

Author: akx

Tests/test_image_getbbox.py

@@ -65,7 +65,7 @@ def check(im: Image.Image, fill_color: int | tuple[int, ...]) -> None:
 def test_bbox_edges(mode: str, box: tuple[int, int, int, int]) -> None:
     im = Image.new(mode, (100, 100), 0)
     bands = Image.getmodebands(mode)
-    im.paste(255 if bands == 1 else (255,) * bands, box)
+    im.paste((255,) * bands, box)
     assert im.getbbox() == box