remove dpi pil_kwarg from print_webp

Author: kinshukdua

lib/matplotlib/backends/backend_agg.py

@@ -613,7 +613,6 @@ def print_webp(self, filename_or_obj, *, pil_kwargs=None):
         FigureCanvasAgg.draw(self)
         if pil_kwargs is None:
             pil_kwargs = {}
-        pil_kwargs.setdefault("dpi", (self.figure.dpi, self.figure.dpi))
         return (Image.fromarray(np.asarray(self.buffer_rgba()))
                 .save(filename_or_obj, format='webp', **pil_kwargs))