disable_auto_open_safe_downloads: Add check

- Add full disk access permission check
- See #18

Lockdown

@@ -557,8 +557,13 @@ function disable_auto_open_safe_downloads {
 
   title="Disable Safari Auto Open 'safe' Files"
 
-  audit_command="defaults read com.apple.Safari AutoOpenSafeDownloads | grep -q '0'"
+  if ! full_disk_access_check "${title}"; then 
+    echo "  [⚠️ ] ${title} (${RED}Requires 'Full Disk Access' permission${RESET})"
+    echo "  [🍺] See the 'Full Disk Access Permission' section of 'README.md' for instructions" 
+    return 1
+  fi
 
+  audit_command="defaults read com.apple.Safari AutoOpenSafeDownloads | grep -q '0'"
   fix_command="defaults write com.apple.Safari AutoOpenSafeDownloads -bool false"
 
   mode_check "${mode}" "${title}" "${audit_command}" "${fix_command}"