main-window: Use CallsHistoryBox

This helps the window to be only a glue in between the actual UI
elements instead of handling a lot of the UI.

src/ui/history-box.ui

@@ -6,7 +6,7 @@
   <object class="GtkListStore" id="history_store"/>
   <template class="CallsHistoryBox" parent="GtkTreeView">
     <property name="can_focus">False</property>
-      <property name="model">history_store</property>
+    <property name="model">history_store</property>
     <property name="visible">True</property>
     <child internal-child="selection">
       <object class="GtkTreeSelection"/>

src/ui/main-window.ui

@@ -3,7 +3,6 @@
 <interface>
   <requires lib="gtk+" version="3.20"/>
   <requires lib="libhandy" version="0.0"/>
-  <object class="GtkListStore" id="history_store"/>
   <object class="GtkListStore" id="origin_store">
     <columns>
       <!-- column-name name -->
@@ -259,13 +258,9 @@
               </packing>
             </child>
             <child>
-              <object class="GtkTreeView" id="history_view">
+              <object class="CallsHistoryBox" id="history_view">
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
-                <property name="model">history_store</property>
-                <child internal-child="selection">
-                  <object class="GtkTreeSelection"/>
-                </child>
               </object>
               <packing>
                 <property name="name">history</property>