Remove duplicated code that was unnecessarily reinitializing variables.

pix = fitz.Pixmap(pix, width, height)

File ".../pymupdf/__init__.py", line 9829, in __init__
   spix, w, h, clip = args
ValueError: not enough values to unpack (expected 4, got 3)

src/__init__.py

@@ -9828,9 +9828,7 @@ def __init__(self, *args):
                 spix, w, h, clip = args
                 bbox = JM_irect_from_py(clip)
 
-            spix, w, h, clip = args
             src_pix = spix.this if isinstance(spix, Pixmap) else spix
-            bbox = JM_irect_from_py(clip)
             if not mupdf.fz_is_infinite_irect(bbox):
                 pm = mupdf.fz_scale_pixmap(src_pix, src_pix.x(), src_pix.y(), w, h, bbox)
             else: