[turbolizer] Fix typo in scrolling of assembly pane

Bug: v8:7327

Change-Id: Id1dbe6ad2cbf790075e360c5d0b5422d2ca4271b
Reviewed-on: https://chromium-review.googlesource.com/928221Reviewed-by: Daniel Clifford <danno@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51413}

tools/turbolizer/turbo-visualizer.css

@@ -254,7 +254,7 @@ span.linkable-text:hover {
 }
 
 .viewpane {
-    height: 100vw;
+    height: 100vh;
     background-color: #FFFFFF;
 }