resticw: fix install prefix

bin/resticw

@@ -125,7 +125,7 @@ eval "$(docopt "$@")" # See https://github.com/andsens/docopt.sh for the magic :
 
 # Exit on error, unbound variable, pipe error
 set -euo pipefail
-ENV_DIR=/etc/restic
+ENV_DIR=$INSTALL_PREFIX/etc/restic
 
 ERR_NO_SUCH_PROFILE=2
 ERR_PROFILE_NO_READ_PERM=3
@@ -144,4 +144,3 @@ echo -e "‣ Using profile: ${__profile}  --  (${profile_file})\n"
 
 # shellcheck disable=SC2154,SC1090
 source "$profile_file" && restic "${_restic_arguments_line_[@]}"
-