patch widgets (#3238)

Co-authored-by: Alessio Buccino <alejoe9187@gmail.com>

Author: h-mayorquin

src/spikeinterface/widgets/utils_ipywidgets.py

@@ -10,7 +10,9 @@ def check_ipywidget_backend():
     import matplotlib
 
     mpl_backend = matplotlib.get_backend()
-    assert "ipympl" in mpl_backend, "To use the 'ipywidgets' backend, you have to set %matplotlib widget"
+    assert (
+        "ipympl" in mpl_backend or "widget" in mpl_backend
+    ), "To use the 'ipywidgets' backend, you have to set %matplotlib widget"
 
 
 class TimeSlider(W.HBox):