Branding selectionFontFamily and annotationFontFamily support

src/sidebar/templates/annotation.html

@@ -63,6 +63,7 @@
       overflow-hysteresis="20"
       content-data="selector.exact">
       <blockquote class="annotation-quote"
+        h-branding="selectionFontFamily"
         ng-bind="selector.exact"
         ng-repeat="selector in target.selector
           | filter : {'type': 'TextQuoteSelector'}

src/sidebar/templates/markdown.html

@@ -15,8 +15,11 @@
 </div>
 <textarea class="form-input form-textarea js-markdown-input"
           ng-show="showEditor()"
-          ng-click="$event.stopPropagation()"></textarea>
+          ng-click="$event.stopPropagation()"
+          h-branding="annotationFontFamily"
+          ></textarea>
 <div class="markdown-body js-markdown-preview"
      ng-class="preview && 'markdown-preview'"
      ng-dblclick="togglePreview()"
-     ng-show="!showEditor()"></div>
+     ng-show="!showEditor()"
+     h-branding="annotationFontFamily"></div>