Duplicate raylines when changing topic in `Visualize frustum` plugin

[XINJIANGMO]

Environment

• OS Version: Ubuntu 24.04
• Source or binary build?
  source , gz-rendering10
• If this is a GUI or sensor rendering bug, describe your GPU and rendering system. Otherwise delete this section.
  • Rendering plugin: ogre2

Description

• Expected behavior: only raylines of selected topic
• Actual behavior: duplicate raylines

Steps to reproduce

1. gz sim visualize_frustum_rgb_camera.sdf
2. refresh and change topic in visualize frustum GUI plugin

the screenshot from the Extend rgb camera for visualize frustum plugin#3374