[ios] Increase Margin of Error in Find in Page Javascript Test

For iOS 13, the scroll position for iPad is slightly larger.
This shouldn't make the test significantly more unreliable since it
is just bumping it up 0.5.

Bug: 983149
Change-Id: I588f9a7566959c15ea3fae492fa864a44c5e205e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1697533Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676901}

ios/web/web_state/js/find_in_page_js_unittest.mm

@@ -432,7 +432,7 @@ TEST_F(FindInPageJsTest, CheckFindInPageScrollsToMatch) {
   }));
   // Scroll offset should either be 1035.333 for most iPhone and 1035.5 for iPad
   // and 5S.
-  EXPECT_NEAR(top_scroll_after_select, 1035, 0.5);
+  EXPECT_NEAR(top_scroll_after_select, 1035, 1.0);
 }
 
 // Tests that FindInPage is able to clear CSS and match highlighting.