Make Camera3D gizmo clickable

(cherry picked from commit ca9063fe4ecbf261768d9e21fb0fb5d83bb2dfa8)

editor/spatial_editor_gizmos.cpp

@@ -1450,6 +1450,7 @@ void CameraSpatialGizmoPlugin::redraw(EditorSpatialGizmo *p_gizmo) {
 #undef ADD_QUAD
 
 	p_gizmo->add_lines(lines, material);
+	p_gizmo->add_collision_segments(lines);
 	p_gizmo->add_handles(handles, get_material("handles"));
 
 	ClippedCamera *clipcam = Object::cast_to<ClippedCamera>(camera);