editors/focuswriter: Update to 1.7.2

Changelog:

• FIXED: Minimum sizes for page counts were too high.
• FIXED: Window icon didn't work in Wayland.
• Require Qt 5.9.
• Improved loading locales.
• Translation updates: Friulian, Korean.

https://github.com/gottcode/focuswriter/blob/v1.7.2/ChangeLog

PR: 236395
Submitted by: lightside <lightside@gmx.com> (maintainer)
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D19520