Remove old Alpine 3.13 reference from Dockerfile-linux.template

Author: jnoordsij

Dockerfile-linux.template

@@ -60,9 +60,6 @@ RUN apk add --no-cache \
 
 # ensure www-data user exists
 RUN set -eux; \
-{{ if env.alpineVer == "3.13" then ( -}}
-	addgroup -g 82 -S www-data; \
-{{ ) else "" end -}}
 	adduser -u 82 -D -S -G www-data www-data
 # 82 is the standard uid/gid for "www-data" in Alpine
 # https://git.alpinelinux.org/aports/tree/main/apache2/apache2.pre-install?h=3.14-stable