expand-home is wrong on windows when passed a string with a forward slash

[jjttjj]

(fs/expand-home "~/my-file") ;; "C:\\Users\\my-file" incorrect, missing username directory when using forward slash in the argument
(fs/expand-home "~\\my-file") ;; "C:\\Users\\justin\\my-file" correct
(fs/expand-home (fs/path "~/my-file")) ;; "C:\\Users\\justin\\my-file" correct

This is because the current expand-home implementation just looks for the index of the path separator in the input. Calling as-path on the input within expand-home should fix this.

I will provide a PR for this today or tomorrow