system/btop: Update to 15.0 template.

Signed-off-by: B. Watson <yalhcru@gmail.com>

system/btop/btop.SlackBuild

@@ -22,6 +22,8 @@
 #  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+cd $(dirname $0) ; CWD=$(pwd)
+
 PRGNAM=btop
 VERSION=${VERSION:-1.2.3}
 BUILD=${BUILD:-1}
@@ -35,7 +37,11 @@ if [ -z "$ARCH" ]; then
   esac
 fi
 
-CWD=$(pwd)
+if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
+  echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
+  exit 0
+fi
+
 TMP=${TMP:-/tmp/SBo}
 PKG=$TMP/package-$PRGNAM
 OUTPUT=${OUTPUT:-/tmp}