Use inline parsing for header and footer of modals

This may cause backwards compatibility problems for people relying on
the block mode parsing, but it’s much better for the rest of us as it
avoids an unsightly paragraph tag

core/modules/utils/dom/modal.js

@@ -70,6 +70,7 @@ Modal.prototype.display = function(title,options) {
 	// Render the title of the message
 	var headerWidgetNode = this.wiki.makeTranscludeWidget(title,{
 		field: "subtitle",
+		mode: "inline",
 		children: [{
 			type: "text",
 			attributes: {
@@ -112,6 +113,7 @@ Modal.prototype.display = function(title,options) {
 	}
 	var footerWidgetNode = this.wiki.makeTranscludeWidget(title,{
 		field: "footer",
+		mode: "inline",
 		children: [{
 			type: "button",
 			attributes: {