Grease Pencil: Add Set Corner Type to the point context menu.

This adds the `Set Corner Type` operator to the right click menu.

This was missed in #143688.

Pull Request: https://projects.blender.org/blender/blender/pulls/147013

scripts/startup/bl_ui/space_view3d.py

@@ -8395,6 +8395,7 @@ class VIEW3D_MT_greasepencil_edit_context_menu(Menu):
             col.operator("transform.transform", text="Shrink/Fatten").mode = 'CURVE_SHRINKFATTEN'
             col.operator("grease_pencil.stroke_smooth", text="Smooth Points")
             col.operator("grease_pencil.set_start_point", text="Set Start Point")
+            col.operator_menu_enum("grease_pencil.set_corner_type", property="corner_type")
 
             col.separator()