Fix local variable usage in acronis-agent-status.sh

Fixed error where 'local' keyword was used outside of a function in
the storage status section. Changed to regular variable declarations
and added null check for use_percent to prevent integer expression errors.

modules/backup/acronis-agent-status.sh

@@ -182,16 +182,16 @@ echo ""
 # Check disk space for backups
 echo -e "${BOLD}Storage Status:${NC}"
 if [ -d "/var/lib/Acronis" ]; then
-    local backup_dir_size=$(du -sh /var/lib/Acronis 2>/dev/null | awk '{print $1}')
+    backup_dir_size=$(du -sh /var/lib/Acronis 2>/dev/null | awk '{print $1}')
     echo -e "  Acronis data: ${backup_dir_size}"
 
     # Check free space
-    local free_space=$(df -h /var/lib/Acronis | tail -1 | awk '{print $4}')
+    free_space=$(df -h /var/lib/Acronis | tail -1 | awk '{print $4}')
-    local use_percent=$(df -h /var/lib/Acronis | tail -1 | awk '{print $5}' | tr -d '%')
+    use_percent=$(df -h /var/lib/Acronis | tail -1 | awk '{print $5}' | tr -d '%')
 
     echo -e "  Free space:   ${free_space}"
 
-    if [ "$use_percent" -gt 90 ]; then
+    if [ -n "$use_percent" ] && [ "$use_percent" -gt 90 ] 2>/dev/null; then
         echo -e "  ${RED}⚠ Warning: Disk usage at ${use_percent}%${NC}"
     fi
 fi