fix: correct import path for filemanager plugins

[hacdias]

That ^ 😄

[francislavoie]

This looks fine. The CI fail doesn't seem to be because of this change, looks like gofmt needs to be run again @mholt

[mholt]

Hmmm, I've run it twice. I can't quite figure out why it's failing...

$ gometalinter --disable-all -E vet -E gofmt -E misspell -E ineffassign -E goimports -E deadcode --tests --vendor ./...
caddytls/handshake.go:1::warning: file is not gofmted with -s (gofmt)
caddytls/handshake.go:1::warning: file is not goimported (goimports)
The command "gometalinter --disable-all -E vet -E gofmt -E misspell -E ineffassign -E goimports -E deadcode --tests --vendor ./..." exited with 1.

That file definitely isn't changed in this PR. 😕

[mholt]

Thanks for maintaining these, Henrique! We love your plugins. :)