development/python3-matplotlib: Align with template.

Signed-off-by: B. Watson <urchlay@slackware.uk>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

development/python3-matplotlib/python3-matplotlib.SlackBuild

@@ -60,7 +60,7 @@ if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
 fi
 
 TMP=${TMP:-/tmp/SBo}
-PKG=${PKG:-$TMP/package-$PRGNAM}
+PKG=$TMP/package-$PRGNAM
 OUTPUT=${OUTPUT:-/tmp}
 
 set -e