Make adding track process to set interpolation type on creating RESET

editor/animation_track_editor.cpp

@@ -4485,6 +4485,7 @@ AnimationTrackEditor::TrackIndices AnimationTrackEditor::_confirm_insert(InsertD
 			if (p_id.type == Animation::TYPE_VALUE) {
 				undo_redo->add_do_method(reset_anim, "value_track_set_update_mode", p_next_tracks.reset, update_mode);
 			}
+			undo_redo->add_do_method(reset_anim, "track_set_interpolation_type", p_next_tracks.reset, interp_type);
 			undo_redo->add_do_method(reset_anim, "track_insert_key", p_next_tracks.reset, 0.0f, value);
 			undo_redo->add_undo_method(reset_anim, "remove_track", reset_anim->get_track_count());
 			p_next_tracks.reset++;