[ Gardening ] New Test: [ iOS ] editing/selection/doubleclick-whitespace-live-range.html is a constant text failure

https://bugs.webkit.org/show_bug.cgi?id=248919
rdar://103097598

Unreviewed test gardening.

* LayoutTests/platform/ios/TestExpectations:

Canonical link: https://commits.webkit.org/257529@main

Author: robert-jenner

LayoutTests/platform/ios/TestExpectations

@@ -3791,3 +3791,5 @@ webkit.org/b/247831 fast/images/animated-avif.html [ Timeout ]
 
 # Screen Orientation API doesn't support nested frames yet
 imported/w3c/web-platform-tests/screen-orientation/onchange-event-subframe.html [ Skip ]
+
+webkit.org/b/248919 editing/selection/doubleclick-whitespace-live-range.html [ Failure ]