Fix JavaScript syntax error - remove duplicate keydown handler

BUGFIX: Uncaught SyntaxError expected expression, got ')'

PROBLEM: Console error on page load due to malformed JavaScript

ROOT CAUSE: Previous replacement left duplicate code fragment:
- Closing brace of updateDropdownHighlight function was followed by
  'kup.addEventListener' (missing 'loo' prefix)
- This created invalid JavaScript syntax
- Old keydown handler wasn't fully removed

SOLUTION: Removed the duplicate/malformed keydown listener block

The proper keydown handler with arrow key navigation is earlier
in the code and works correctly.

app/Views/billing/ipd/discharge_create.php

@@ -1820,15 +1820,7 @@ $allergyStatusNoKnown = in_array($allergyStatusNormalized, ['no known drug aller
                             item.style.fontWeight = '';
                         }
                     });
-                }kup.addEventListener('keydown', function(e) {
-                    if (e.key === 'Enter' && btnAdd) {
-                        e.preventDefault();
-                        dropdown.style.display = 'none';
-                        btnAdd.click();
-                    } else if (e.key === 'Escape') {
-                        dropdown.style.display = 'none';
-                    }
-                });
+                }
 
                 lookup.addEventListener('blur', function() {
                     setTimeout(function() {