Remove unused 3D field image #1162

Job	Run time
Check & Compile	5m 37s
WPILib: Build for Windows (x64)	10m 5s
Build for Windows (x64)	7m 41s
Build for macOS (x64)	2m 30s
WPILib: Build for Windows (arm64)	5m 46s
Build for Linux/AppImage (x64)	1m 47s
Build for Windows (arm64)	7m 7s
Build for macOS (arm64)	3m 12s
Build for Linux/AppImage (arm64)	1m 43s
WPILib: Build for Linux (x64)	1m 15s
Build for Linux/AppImage (armv7l)	1m 57s
WPILib: Build for macOS (x64)	2m 21s
WPILib: Build for Linux (arm64)	1m 19s
WPILib: Build for macOS (arm64)	3m 0s
Finalize Release	0s
	55m 20s

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