trade: fixed proxy roles of Order_applyTradeCondition

Such script might be called when only owner has right to do modification,
or only assignee, or only assignor depending on configuration. Thus use
Manager in proxy fole.

This is ok since the guard check for modify portal content before calling

bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/Order_applyTradeCondition.xml

@@ -50,9 +50,7 @@
         </item>
         <item>
             <key> <string>_body</string> </key>
-            <value> <string encoding="cdata"><![CDATA[
-
-order = context\n
+            <value> <string>order = context\n
 \n
 # copy categories\n
 category_list = [\n
@@ -137,9 +135,7 @@ else:\n
 new_category_dict[\'specialise\'] = trade_condition.getRelativeUrl()\n
 \n
 order.edit(**new_category_dict)\n
-
-
-]]></string> </value>
+</string> </value>
         </item>
         <item>
             <key> <string>_params</string> </key>
@@ -149,8 +145,8 @@ order.edit(**new_category_dict)\n
             <key> <string>_proxy_roles</string> </key>
             <value>
               <tuple>
-                <string>Assignee</string>
-                <string>Auditor</string>
+                <string>Manager</string>
+                <string>Owner</string>
               </tuple>
             </value>
         </item>