[css-flex] Delete test line from TestExpectations

Forgotten when I deleted the test in https://chromium-review.googlesource.com/c/chromium/src/+/1900404

TBR=cbiesinger@chromium.org

Change-Id: I371919d31ff08ffede168ff01db640ad71769c7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900631Reviewed-by: David Grogan <dgrogan@chromium.org>
Commit-Queue: David Grogan <dgrogan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712870}

third_party/blink/web_tests/TestExpectations

@@ -1455,7 +1455,6 @@ crbug.com/591099 virtual/layout_ng_flex_box/external/wpt/css/css-flexbox/scrollb
 crbug.com/591099 virtual/layout_ng_flex_box/external/wpt/css/css-flexbox/scrollbars.html [ Failure ]
 crbug.com/591099 virtual/layout_ng_flex_box/external/wpt/css/css-flexbox/table-as-item-auto-min-width.html [ Failure ]
 crbug.com/591099 virtual/layout_ng_flex_box/external/wpt/css/css-flexbox/ttwf-reftest-flex-inline.html [ Failure ]
-crbug.com/591099 virtual/layout_ng_flex_box/external/wpt/css/css-flexbox/ttwf-reftest-flex-order.html [ Failure ]
 crbug.com/591099 virtual/layout_ng_flex_box/external/wpt/css/css-flexbox/hittest-overlapping-margin.html [ Failure ]
 crbug.com/591099 virtual/layout_ng_flex_box/external/wpt/css/css-flexbox/hittest-overlapping-order.html [ Failure ]