Give the target type choice a width the stylesheet defines

The type select used w-40, which the committed static/css/tailwind.css
has no rule for, so it took the full width and pushed Next and Cancel
onto the line below. It now uses w-32, as the old type select did, so
the type choice, Next and Cancel sit on one row.

Model: opus-5-5

templates/source_detail.html

@@ -137,7 +137,7 @@
             <form method="POST" action="/hook/{{.Webhook.ID}}/targets" x-ref="form">
                 <input type="hidden" name="csrf_token" value="{{.CSRFToken}}">
                 <div x-show="choosing" x-cloak class="p-4 bg-gray-50 border-b border-gray-200 flex flex-wrap gap-2">
-                    <select x-ref="type" aria-label="Target type" class="input text-sm w-40">
+                    <select x-ref="type" aria-label="Target type" class="input text-sm w-32">
                         <option value="http">HTTP</option>
                         <option value="slack">Slack</option>
                         <option value="database">Database</option>