Minor layout fixes (chyron, list of speakers)

- use bold font for names on chyron
- Fix box height for list of speakers view (for normal users in Firefox)

client/src/app/shared/components/sorting-list/sorting-list.component.scss

@@ -4,6 +4,8 @@
     display: table;
     width: 100%;
     font-size: 14px;
+    // required since firefox has issues if this view is not in edit mode
+    height: 1px;
     min-height: 50px;
     margin-bottom: 5px;
 

client/src/app/slides/agenda/current-speaker-chyron/current-speaker-chyron-slide.component.html

@@ -3,6 +3,6 @@
     color: data.data.font_color}">
 
     <span id="inner">
-        {{ data.data.current_speaker }}
+        <b>{{ data.data.current_speaker }}</b>
     </span>
 </div>