Revert tools.func changes, keep only Guacamole JDK 11→17 bump

Co-authored-by: MickLesk <47820557+MickLesk@users.noreply.github.com>

misc/tools.func

@@ -962,9 +962,13 @@ get_fallback_suite() {
   local distro_codename="$2"
   local repo_base_url="$3"
 
-  # Comprehensive fallback mappings (applied first for known distros to avoid
-  # repos that exist via HTTP but ship packages with broken dependencies on
-  # newer releases, e.g. Adoptium trixie → p11-kit missing on Debian 13)
+  # Check if current codename works
+  if verify_repo_available "$repo_base_url" "$distro_codename"; then
+    echo "$distro_codename"
+    return 0
+  fi
+
+  # Comprehensive fallback mappings
   case "$distro_id" in
   debian)
     case "$distro_codename" in