fix(devkit): FileReplacement type typo

[mina-skunk]

fixes #11294

[mina-skunk]

I intermittently get the ENOTEMPTY error from continuous-integration/appveyor/pr when running npm run test-large even before introducing these changes.

[mina-skunk]

Still can't get npm run test-large to pass on original master.

[alan-agius4]

Can you please try to rebase? Thanks.

[alan-agius4]

Superseded by #12053

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