Resolves: tdf#159498 Items in Template Manager dropdown should be left-aligned

Change-Id: I72d32793814b28b7452be701f0732dbd9dbbcb37
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/165483
Tested-by: Jenkins
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
(cherry picked from commit b206e3b90a4ba34604a5e45faf3f05639ee89752)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/165615
diff --git a/vcl/unx/gtk3/gtkinst.cxx b/vcl/unx/gtk3/gtkinst.cxx
index d39c37a..38767cc 100644
--- a/vcl/unx/gtk3/gtkinst.cxx
+++ b/vcl/unx/gtk3/gtkinst.cxx
@@ -5504,8 +5504,9 @@ public:
        {
            GtkBox *pBox = GTK_BOX(gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 6));
            GtkWidget *pLabel = gtk_label_new_with_mnemonic(MapToGtkAccelerator(rStr).getStr());
            gtk_label_set_xalign(GTK_LABEL(pLabel), 0.0);
            pItem = eCheckRadioFalse != TRISTATE_INDET ? gtk_check_menu_item_new() : gtk_menu_item_new();
            gtk_box_pack_start(pBox, pImage, true, true, 0);
            gtk_box_pack_start(pBox, pImage, false, true, 0);
            gtk_box_pack_start(pBox, pLabel, true, true, 0);
            gtk_container_add(GTK_CONTAINER(pItem), GTK_WIDGET(pBox));
            gtk_widget_show_all(pItem);