WebUI: Remove min-height for all extensions-toggle-row

Screenshots: https://bugs.chromium.org/p/chromium/issues/detail?id=911008#c1

Bug: 911008
Change-Id: I26748c195fa18cb30dc98a7bb14a1e231337261f
Reviewed-on: https://chromium-review.googlesource.com/c/1358702Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613371}

chrome/browser/resources/md_extensions/detail_view.html

@@ -143,6 +143,9 @@
 
       extensions-toggle-row {
         @apply --cr-section;
+        /* TODO(johntlee): remove min-height override once --cr-section's
+         * min-height is removed (crbug.com/686905). */
+        min-height: initial;
         padding-bottom: 16px;
         padding-inline-end: 0;
         padding-inline-start: 0;