[gnome-calculator] Made the base conversion display selectable (see #123)

[Robert Roth <robertroth src gnome org>]

commit db918034402b53fd61a31335c7f957b3bd061db2
Author: Robert Roth <robert roth off gmail com>
Date:   Thu Oct 3 22:53:00 2019 +0300

    Made the base conversion display selectable (see #123)

 src/buttons-programming.ui | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/buttons-programming.ui b/src/buttons-programming.ui
index 60a49277..f8e33b62 100644
--- a/src/buttons-programming.ui
+++ b/src/buttons-programming.ui
@@ -24,6 +24,8 @@
         <child>
           <object class="GtkLabel" id="base_label">
             <property name="visible">True</property>
+            <property name="selectable">True</property>
+            <property name="can-focus">False</property>
             <property name="halign">end</property>
             <property name="label" comments="Example content">FF₁₆ 256₁₀</property>
           </object>