Fix Modo/Maya navigation conflicts with Path3D editor shortcuts

[ryevdokimov]

Fixes: #117389

This uses the same solution as the gridmap editor:

godot/modules/gridmap/editor/grid_map_editor_plugin.cpp

Lines 907 to 910 in a8e37fc

	View3DController::NavigationScheme nav_scheme = (View3DController::NavigationScheme)EDITOR_GET("editors/3d/navigation/navigation_scheme").operator int();
	if ((nav_scheme == View3DController::NAV_SCHEME_MAYA || nav_scheme == View3DController::NAV_SCHEME_MODO) && mb->is_alt_pressed()) {
	return EditorPlugin::AFTER_GUI_INPUT_PASS;
	}

[akien-mga]

Thanks!