fix: remove unused LOD_BUCKET env variable (#64) #303

Job	Run time
main (unityci/editor:2022.3.12f1-webgl-3.0.0, asset-bundle-converter, webgl)	16s
main (unityci/editor:2022.3.12f1-webgl-3.0.0, asset-bundle-converter, webgl)	22s
main (unityci/editor:2022.3.12f1-webgl-3.0.0, asset-bundle-converter, webgl)	16s
main (unityci/editor:2022.3.12f1-webgl-3.0.0, asset-bundle-converter, webgl)	19s
main (unityci/editor:2022.3.12f1-webgl-3.0.0, asset-bundle-converter, webgl)	23s
main (unityci/editor:2022.3.12f1-windows-mono-3.0.0, asset-bundle-converter-windows, windows)	14s
main (unityci/editor:2022.3.12f1-windows-mono-3.0.0, asset-bundle-converter-windows, windows)	26s
main (unityci/editor:2022.3.12f1-windows-mono-3.0.0, asset-bundle-converter-windows, windows)	17s
main (unityci/editor:2022.3.12f1-windows-mono-3.0.0, asset-bundle-converter-windows, windows)	18s
main (unityci/editor:2022.3.12f1-windows-mono-3.0.0, asset-bundle-converter-windows, windows)	22s
main (unityci/editor:2022.3.12f1-mac-mono-3.0.0, asset-bundle-converter-mac, mac)	15s
main (unityci/editor:2022.3.12f1-mac-mono-3.0.0, asset-bundle-converter-mac, mac)	21s
main (unityci/editor:2022.3.12f1-mac-mono-3.0.0, asset-bundle-converter-mac, mac)	13s
main (unityci/editor:2022.3.12f1-mac-mono-3.0.0, asset-bundle-converter-mac, mac)	13s
main (unityci/editor:2022.3.12f1-mac-mono-3.0.0, asset-bundle-converter-mac, mac)	19s
	4m 34s

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