[zcash/zcash] Fix license to match upstream (#3468)

This is harmless, and matches upstream (https://github.com/bitcoin/bitcoin/commit/d552ed678c2632bafeab695c639f5fe185dc9853). However, if it’s changed here then it also needs to be changed at https://github.com/zcash/zcash/blob/e868f8247faea8cc74aef69262d93bdeacc82c53/contrib/debian/copyright#L6-L12

Otherwise utACK.

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