Add by default the result file to the map canvas

Author: DelazJ

python/plugins/fTools/tools/frmSumLines.ui

@@ -116,6 +116,9 @@
      <property name="text">
       <string>Add result to canvas</string>
      </property>
+     <property name="checked">
+      <bool>true</bool>
+     </property>
     </widget>
    </item>
    <item row="6" column="0">