Fix frame capture when using PyQt6 (#43)

See
#40 (comment),
#42 (comment)

These failures were caused by an intervening frame in QtPy when using
the Qt6 backend, because QtPy replaced some removed functions in the
Qt5->Qt6 transition with their own implementations:


https://github.com/spyder-ide/qtpy/blob/1d2a1eae43bda2a3d0efef605cafc5462389ec03/qtpy/QtWidgets.py#L69-L105

Therefore, when looking for "first frame in the call stack that is not
in napari", the frame capture code would stop in QtPy. By adding QtPy to
the list of ignored prefixes, this PR fixes the issue in the Qt6 case.

napari_console/qt_console.py

@@ -19,7 +19,7 @@
 from napari.utils.naming import CallerFrame
 
 
-_PREF_LIST = ["napari.", "napari_console.", "in_n_out."]
+_PREF_LIST = ["napari.", "napari_console.", "in_n_out.", "qtpy."]
 
 
 def str_to_rgb(arg):