fix: do not return negative quotas

limitator

@@ -87,7 +87,12 @@ get_total_quota_until_today(){
 }
 
 get_remaining_quota(){
-    echo -n $(($(get_total_quota_until_today) - $(get_current_used_bytes)))
+    local remaining_quota=$(($(get_total_quota_until_today) - $(get_current_used_bytes)))
+    if [ $remaining_quota -lt 0 ]; then
+        echo 0
+    else
+        echo -n $remaining_quota
+    fi
 }
 
 show_remaining_quota(){