Drop mw-body-content class from #bodyContent

The CSS class is being added to `$this->get( 'bodytext' )`
which will make this class here redundant.

Depends-On: I3a91b294fcb3724cd46743e497dff723de0490a6
Bug: T279388
Change-Id: I8a8e47fd419626ebf7bf44d0b25b16a933c1367a

includes/TimelessTemplate.php

@@ -163,7 +163,7 @@ class TimelessTemplate extends BaseTemplate {
 					)
 				) .
 				$this->getClear() .
-				Html::rawElement( 'div', [ 'class' => 'mw-body-content', 'id' => 'bodyContent' ],
+				Html::rawElement( 'div', [ 'id' => 'bodyContent' ],
 					$this->getContentSub() .
 					$this->get( 'bodytext' ) .
 					$this->getClear()