[LyX/master] Fix issues with tilde in inputpath

[Richard Kimberly Heck]

On 11/20/19 5:43 AM, Juergen Spitzmueller wrote:
> commit a426b33067ae4e9d5452f13284f3e223d87ac45d
> Author: Juergen Spitzmueller <spitz at lyx.org>
> Date:   Wed Nov 20 11:57:32 2019 +0100
>
>     Fix issues with tilde in inputpath
>     
>     Fixes #11699
> ---

Fine for stable if needed.

Riki