chore: delete unused template values

mix.exs

@@ -542,7 +542,6 @@ defmodule EMQXUmbrella.MixProject do
       runner_etc_dir: "$RUNNER_ROOT_DIR/etc",
       runner_lib_dir: "$RUNNER_ROOT_DIR/lib",
       runner_log_dir: "$RUNNER_ROOT_DIR/log",
-      runner_data_dir: "$RUNNER_ROOT_DIR/data",
       runner_user: "",
       release_version: release.version,
       erts_vsn: release.erts_version,
@@ -570,7 +569,6 @@ defmodule EMQXUmbrella.MixProject do
       runner_etc_dir: "/etc/emqx",
       runner_lib_dir: "$RUNNER_ROOT_DIR/lib",
       runner_log_dir: "/var/log/emqx",
-      runner_data_dir: "/var/lib/emqx",
       runner_user: "emqx",
       release_version: release.version,
       erts_vsn: release.erts_version,

rebar.config.erl

@@ -261,7 +261,6 @@ overlay_vars_pkg(bin) ->
     , {runner_etc_dir, "$RUNNER_ROOT_DIR/etc"}
     , {runner_lib_dir, "$RUNNER_ROOT_DIR/lib"}
     , {runner_log_dir, "$RUNNER_ROOT_DIR/log"}
-    , {runner_data_dir, "$RUNNER_ROOT_DIR/data"}
     , {runner_user, ""}
     , {is_elixir, "no"}
     ];
@@ -277,7 +276,6 @@ overlay_vars_pkg(pkg) ->
     , {runner_etc_dir, "/etc/emqx"}
     , {runner_lib_dir, "$RUNNER_ROOT_DIR/lib"}
     , {runner_log_dir, "/var/log/emqx"}
-    , {runner_data_dir, "/var/lib/emqx"}
     , {runner_user, "emqx"}
     , {is_elixir, "no"}
     ].