Fix update log permission error: remove redundant file truncation

Author: maratal

update.sh

@@ -6,7 +6,6 @@ set -euo pipefail
 
 # Redirect all output to the log file (and console via tee)
 LOG_FILE="/tmp/chatserver-update.log"
-: > "$LOG_FILE"
 exec > >(tee "$LOG_FILE") 2>&1
 
 # Configuration