ContactForm should use OOUI for form rendering

This makes the form style itself on mobile
This will however break compatibility with configurations that
use the `cols` parameter

Bug: T162538
Change-Id: I8f5cf572b97b0789b516d0fc556f8de5d5ca5555

README

@@ -81,7 +81,8 @@ It should be noted that type 'selectandother' is not currently supported.
   ),
 
 DisplayFormat is used to configure the HTMLForm. See HTMLForm documentation
-for possible values.
+for possible values. Recommended value is "ooui" for consistency with other
+forms and better mobile rendering.
 
 RLModules can be used to add ResourceLoader modules (custom CSS and
 JavaScript) to the page.

extension.json

@@ -19,21 +19,20 @@
 	},
 	"config": {
 		"ContactConfig": {
+			"@doc": "Use DisplayFormat `ooui` for compatibility with most skins.",
 			"default": {
 				"RecipientUser": null,
 				"SenderEmail": null,
 				"SenderName": null,
 				"RequireDetails": false,
 				"IncludeIP": false,
-				"DisplayFormat": "table",
+				"DisplayFormat": "ooui",
 				"RLModules": [],
 				"RLStyleModules": [],
 				"AdditionalFields": {
 					"Text": {
 						"label-message": "emailmessage",
 						"type": "textarea",
-						"rows": 20,
-						"cols": 80,
 						"required": true
 					}
 				}