tdf#123013: Allow to change trendline name in gtk3

Change-Id: I3eeb6b8e27cced0a8a86969368f48a2af8ac5892
Reviewed-on: https://gerrit.libreoffice.org/67026
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/chart2/uiconfig/ui/tp_Trendline.ui b/chart2/uiconfig/ui/tp_Trendline.ui
index a9550a9..2120b2d 100644
--- a/chart2/uiconfig/ui/tp_Trendline.ui
+++ b/chart2/uiconfig/ui/tp_Trendline.ui
@@ -467,7 +467,7 @@
                <child>
                  <object class="GtkEntry" id="entry_name">
                    <property name="visible">True</property>
                    <property name="can_focus">False</property>
                    <property name="can_focus">True</property>
                    <property name="activates_default">True</property>
                  </object>
                  <packing>