gtk: let math GtkIconViews flow to fill available space with icons

Change-Id: I25f3433e9404ac1938568607a9a52a50ca8a7892
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/135513
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/starmath/uiconfig/smath/ui/dockingelements.ui b/starmath/uiconfig/smath/ui/dockingelements.ui
index a9f1086..604ffc0 100644
--- a/starmath/uiconfig/smath/ui/dockingelements.ui
+++ b/starmath/uiconfig/smath/ui/dockingelements.ui
@@ -45,7 +45,6 @@
            <property name="hexpand">True</property>
            <property name="vexpand">True</property>
            <property name="model">liststore1</property>
            <property name="columns">2</property>
            <property name="pixbuf-column">0</property>
            <property name="activate-on-single-click">True</property>
          </object>
diff --git a/starmath/uiconfig/smath/ui/sidebarelements_math.ui b/starmath/uiconfig/smath/ui/sidebarelements_math.ui
index e82e603..80bdfda 100644
--- a/starmath/uiconfig/smath/ui/sidebarelements_math.ui
+++ b/starmath/uiconfig/smath/ui/sidebarelements_math.ui
@@ -75,7 +75,6 @@
            <property name="hexpand">True</property>
            <property name="vexpand">True</property>
            <property name="model">liststore2</property>
            <property name="columns">2</property>
            <property name="pixbuf-column">0</property>
            <property name="activate-on-single-click">True</property>
          </object>