Set default size for window

camera.glade

@@ -5,6 +5,8 @@
   <object class="GtkWindow" id="window">
     <property name="can-focus">False</property>
     <property name="title" translatable="yes">Camera</property>
+    <property name="default-width">360</property>
+    <property name="default-height">640</property>
     <child>
       <object class="GtkStack" id="main_stack">
         <property name="visible">True</property>