Update the list of tests that may fail

The update of the Docker image we use on our CI introduced changes in
the underlying platform, and that caused some reftests to fail.

testsuite/reftests/meson.build

@@ -429,12 +429,14 @@ test_data = [
 
 # Depending on the environment these fail, feel free to fix them
 somehow_broken = [
-  'label-sizing.ui',
-  'flipping-icons.ui',
-  'window-height-for-width.ui',
+  'button-wrapping.ui',
   'cellrenderer-pixbuf-stock-rtl.ui',
+  'flipping-icons.ui',
+  'label-sizing.ui',
   'label-wrap-justify.ui',
+  'quit-mnemonic.ui',
   'symbolic-icon-translucent-color.ui',
+  'window-height-for-width.ui',
 ]
 
 foreach testname : test_data