Ladybird: Make LocationEdit its own class

Also make return key behave more like other browsers when editing

Ladybird/LocationEdit.cpp

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2023, Cameron Youell <cameronyouell@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "LocationEdit.h"
+#include "Tab.h"
+
+LocationEdit::LocationEdit(Tab* tab)
+    : QLineEdit(tab)
+{
+    connect(this, &QLineEdit::returnPressed, this, [&] {
+        clearFocus();
+    });
+}