graphics/rawtherapee: avoid 2>&1 in test, UCL conversion of pkg-message

• in the smoke tests post-install, don't fold stderr into stdout, remove the 2>&1. Version is emitted on stdout, because there are sporadic reports of one rawtherapee-cli test not proceeding to the echo, and we don't want to mask stderr to see what's up. [1]

• while here, after figuring out that make create-manifest and the porter's handbook are inconsistent [2], convert pkg-message to UCL, and make sure it's printed on install and on upgrade. (Bump PORTREVISION so that pkg-message is shown on upgrade.)
  
  [2] see https://reviews.freebsd.org/D24379

PR: 245592
Reported by: tech-lists@zyxst.net