Fix projectile-recentf with inactive project (#1881)

[gessen]

projectile-recentf-files expands recentf files to use canonicalized versions, /home/example/project instead of ~/project. However, if the project is not active and projectile-recentf was called, it would return non-canonicalized directory which then fails the comparison with recentf list.

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Thanks!

[bbatsov]

Thanks!