lib: remove useless type check on fs
recursive
always is the type boolean
for an example
https://github.com/nodejs/node/blob/eca71e5a0c4b5e4357d8e871a5dc46b10e9bd1f1/lib/fs.js#L766-L773
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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