Disable system_health.memory_desktop/multitab:misc:typical24:2018

The story is already disabled on other version of system health and is
causing the shard to hang indefinitely.

NOTRY=true
TBR=crouleau@chromium.org
CC=perezju@chromium.org

Bug: 934270
Change-Id: Ia5b6328fa1311009cb8da0c6267a3585df5ad46b
Reviewed-on: https://chromium-review.googlesource.com/c/1496540Reviewed-by: Charlie Andrews <charliea@chromium.org>
Commit-Queue: Charlie Andrews <charliea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636664}

tools/perf/expectations.config

@@ -303,6 +303,7 @@ crbug.com/799734 [ Win ] system_health.memory_desktop/browse:media:tumblr [ Skip
 crbug.com/899887 [ Linux ] system_health.memory_desktop/browse:social:facebook_infinite_scroll:2018 [ Skip ]
 crbug.com/924330 [ Linux ] system_health.memory_desktop/browse:media:pinterest:2018 [ Skip ]
 crbug.com/927758 [ Desktop ] system_health.memory_desktop/load:games:alphabetty [ Skip ]
+crbug.com/934270 [ Win ] system_health.memory_desktop/multitab:misc:typical24:2018 [ Skip ]
 
 # Benchmark: system_health.memory_mobile
 crbug.com/787001 [ Android_Webview ] system_health.memory_mobile/load:media:soundcloud [ Skip ]