Misc fixes for event log.

  - Fixed single event log overflow.
  - Fixed incorrect class on log search filter button.
  - Fixed incorrect nested div.
  - Removed duplicate accordion trigger class in event log.
  - Fixed hover for checkboxes to be more prominent.
  - Fixed margin issue with action header for event log.

Change-Id: I156f516316675afde98c233057a8247bc17a1459
diff --git a/app/common/directives/log-search-control.html b/app/common/directives/log-search-control.html
index 0c0c7de..bfd461b 100644
--- a/app/common/directives/log-search-control.html
+++ b/app/common/directives/log-search-control.html
@@ -1,5 +1,5 @@
 <div class="content__search">
     <label for="content__search-input">Event Log Search</label>
     <input id="content__search-input" type="text" placeholder="Filter issues" ng-model="customSearch" ng-keydown="doSearchOnEnter($event)"/>
-    <input id="content__search-submit" type="submit" class="btn btn-secondary" value="Filter" ng-click="doSearchOnClick()"/>
+    <input id="content__search-submit" type="submit" class="btn btn-primary" value="Filter" ng-click="doSearchOnClick()"/>
 </div>
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