luci-mod-network: disable 'Edit' button for dynamic interfaces

Otherwise they produce "Cannot read properties of null".

Tested on 23.05.2

Fixes issue #6799

Signed-off-by: Paul Donald <newtwen@gmail.com>

modules/luci-mod-network/htdocs/luci-static/resources/view/network/interfaces.js

@@ -537,6 +537,11 @@ return view.extend({
 				tdEl.lastChild.childNodes[3].disabled = true;
 			}
 
+			if (dynamic) {
+				//disable the 'Edit' button on dynamic interfaces
+				tdEl.lastChild.childNodes[2].disabled = true;
+			}
+
 			return tdEl;
 		};