resource: extract.py: pass directory of unpacked Minecraft JAR, not f… #133

Job	Run time
clippy	20s
fmt	4s
build (macos-11, aarch64-apple-darwin)	1m 7s
docs	13s
build (macos-11, x86_64-apple-darwin)	2m 21s
test (ubuntu-latest, stable)	23s
viewer	10s
build (windows-2019, x86_64-pc-windows-msvc, .exe)	1m 45s
test (windows-latest, stable)	1m 3s
build (windows-2019, i686-pc-windows-msvc, .exe)	4m 50s
test (macOS-latest, stable)	1m 19s
build (ubuntu-20.04, x86_64-unknown-linux-gnu)	35s
	14m 10s

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