Apply suggestions from code review

Co-authored-by: Michal Čihař <michal@cihar.com>

Author: nijel

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@@ -418,11 +418,11 @@ set_real_ip_from ::/0;
     : "${CELERY_MAIN_OPTIONS:="--concurrency $WEBLATE_WORKERS"}"
     : "${CELERY_NOTIFY_OPTIONS:="--concurrency $WEBLATE_WORKERS"}"
     : "${CELERY_TRANSLATE_OPTIONS:="--concurrency $WEBLATE_WORKERS"}"
-    : "${CELERY_MEMORY_OPTIONS:="--concurrency $((WEBLATE_WORKERS == 1 ? 1 : (WEBLATE_WORKERS + 1) / 2))"}"
+    : "${CELERY_MEMORY_OPTIONS:="--concurrency $((WEBLATE_WORKERS == 1 ? 1 : WEBLATE_WORKERS / 2))"}"
     : "${CELERY_BACKUP_OPTIONS:="--concurrency 1"}"
     : "${CELERY_BEAT_OPTIONS:=""}"
     : "${CELERY_SINGLE_OPTIONS:=""}"
-    : "${WEB_WORKERS:="$((WEBLATE_WORKERS <= 3 ? 2 : (WEBLATE_WORKERS + 1) / 2))"}"
+    : "${WEB_WORKERS:="$((WEBLATE_WORKERS <= 3 ? 2 : WEBLATE_WORKERS / 2))"}"
     : "${WEB_BLOCKING_THREADS:="$((WEBLATE_WORKERS * 2))"}"
     : "${GRANIAN_ARGS:=""}"