PageInfo: fix zero-division check (x-tools#609)

A division by zero happened today at https://xtools.wmcloud.org/pageinfo/pl.wikipedia.org/Mi%C4%99dzynarodowy%20Bank%20Inwestycyjny/2025-07-12/2025-07-12. it's a weird request to make (pageinfo for exactly two edits including one revdeleted and the rollback), but whatever. We were ensuring that the wrong thing was non-0.

Author: agoujot

src/Model/PageInfo.php

@@ -1007,7 +1007,10 @@ private function getTopTenByAdded(): array {
 			return [
 				'label' => $editor,
 				'value' => $added,
-				'percentage' => $this->addedBytes === 0 ? 0 : 100 * ( $added / $topTenTotalAdded ),
+				'percentage' =>
+					$topTenTotalAdded === 0 ?
+					0 :
+					100 * ( $added / $topTenTotalAdded ),
 			];
 		}, $topTenEditorsByAdded );
 	}