Updated mesh flattener sample

[oppenheimera]

Updated mesh flattener sample

[snippet-bot]

Here is the summary of changes.

You are about to add 9 region tags.

• samples/3d-camera-center/index.html:7, tag maps_3d_camera_center
• samples/3d-camera-center/index.ts:8, tag maps_3d_camera_center
• samples/3d-camera-center/style.css:7, tag maps_3d_camera_center
• samples/3d-marker-html/index.html:7, tag maps_3d_marker_html
• samples/3d-marker-html/index.ts:7, tag maps_3d_marker_html
• samples/3d-marker-html/style.css:7, tag maps_3d_marker_html
• samples/3d-mesh-flatten/index.html:7, tag maps_3d_mesh_flatten
• samples/3d-mesh-flatten/index.ts:7, tag maps_3d_mesh_flatten
• samples/3d-mesh-flatten/style.css:7, tag maps_3d_mesh_flatten

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