Review calibration read command in avrdude.conf #1333

Job	Run time
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 27s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 40s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 31s
macos-x86_64	1m 50s
mingw (mingw32, i686)	2m 56s
mingw (mingw64, x86_64)	3m 1s
linux-x86_64	1m 27s
msvc (x86, Win32)	2m 10s
msvc (x64, x64)	2m 12s
msvc (arm64, ARM64)	2m 36s
	20m 50s

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