Show URLbar icon as insecure when active mixed content is loaded

address #5516

Auditors: @darkdh

Test Plan:
1. go to https://mixed-script.badssl.com/
2. click lock icon to allow mixed content
3. observe urlbar shows up as insecure

js/components/main.js

@@ -967,7 +967,8 @@ class Main extends ImmutableComponent {
                 partitionNumber={activeFrame && activeFrame.get('partitionNumber') || 0}
                 history={activeFrame && activeFrame.get('history') || emptyList}
                 suggestionIndex={activeFrame && activeFrame.getIn(['navbar', 'urlbar', 'suggestions', 'selectedIndex']) || 0}
-                isSecure={activeFrame && activeFrame.getIn(['security', 'isSecure'])}
+                isSecure={activeFrame && activeFrame.getIn(['security', 'isSecure']) &&
+                 !activeFrame.getIn(['security', 'runInsecureContent'])}
                 locationValueSuffix={activeFrame && activeFrame.getIn(['navbar', 'urlbar', 'suggestions', 'urlSuffix']) || ''}
                 startLoadTime={activeFrame && activeFrame.get('startLoadTime') || undefined}
                 endLoadTime={activeFrame && activeFrame.get('endLoadTime') || undefined}