copy KVComboBox.js from manager to manager5

www/manager5/form/KVComboBox.js

@@ -0,0 +1,44 @@
+Ext.define('PVE.form.KVComboBox', {
+    extend: 'Ext.form.field.ComboBox',
+    alias: 'widget.pveKVComboBox',
+
+    deleteEmpty: true,
+    
+    getSubmitData: function() {
+        var me = this,
+            data = null,
+            val;
+        if (!me.disabled && me.submitValue) {
+            val = me.getSubmitValue();
+            if (val !== null && val !== '') {
+                data = {};
+                data[me.getName()] = val;
+            } else if (me.deleteEmpty) {
+		data = {};
+                data['delete'] = me.getName();
+	    }
+        }
+        return data;
+    },
+
+    initComponent: function() {
+	var me = this;
+
+	me.store = Ext.create('Ext.data.ArrayStore', {
+	    model: 'KeyValue',
+	    data : me.data
+	});
+
+	if (me.initialConfig.editable === undefined) {
+	    me.editable = false;
+	}
+
+	Ext.apply(me, {
+	    displayField: 'value',
+	    valueField: 'key',
+	    queryMode: 'local'
+	});
+
+	me.callParent();
+    }
+});