Passing currentPageTitle option to TalkSectionAddOverlay

Passing in a new currentPageTitle option to TalkSectionAddOverlay.
Since `title` param has spaces instead of underscores,
`pageTitle` also gets spaces by using `M.getCurrentPage().title`
instead of mw.config.get( 'wgPageName' )

Bug: T184273
Change-Id: I68a46e512fde0c6c15e888bd3b57da21417b1085

resources/skins.minerva.talk/init.js

@@ -40,6 +40,8 @@
 			talkOptions = {
 				api: new mw.Api(),
 				title: title,
+				// T184273 using `getCurrentPage` because 'wgPageName' contains underscores instead of spaces.
+				currentPageTitle: M.getCurrentPage().title,
 				licenseMsg: skin.getLicenseMsg()
 			};