chg: [nextcloud] don't auto-generate password and require password to be set.

nextcloud/hooks/init

@@ -20,7 +20,9 @@ admin_user=$(options-get admin.user 2>&1) || {
 }
 
 admin_password=$(options-get admin.password 2>&1) || {
-    admin_password="$(gen_password)"
+    err "Please specify an ${WHITE}admin.password${NORMAL} option" \
+        "in ${DARKYELLOW}$SERVICE_NAME${NORMAL} service."
+    exit 1
 }