MFH: r496208

Depend on qt5-linguisttools at runtime too.

This fixes bug 236613, which happens when the KWALLET option is disabled. In
this case, we do not pull in devel/qt5-linguisttools even though Falkon's build
system uses e-c-m's ECMPoQmTools.cmake, which requires linguisttools to be
present. As it turns out, we need to run-depend on linguisttools to prevent
this kind of issue anywhere.

PR: 236613
Reviewed by: tcberner
Differential Revision: https://reviews.freebsd.org/D19629

Approved by: ports-secteam (blanket)