Optimize the APISIX icon in the topology map (#499)

diff --git a/src/views/components/topology/assets/APISIX.png b/src/views/components/topology/assets/APISIX.png
index b74f2ff..3318536 100644
--- a/src/views/components/topology/assets/APISIX.png
+++ b/src/views/components/topology/assets/APISIX.png
Binary files differ