gnome: add audio and video muting buttons.

The look of the button will be improved in another
patch since it will affect the current call UI in general.

Refs #75158

Change-Id: I154607f29d8f85b4b970bfc4ad5d743a7bc13ecb
diff --git a/ui/currentcallview.ui b/ui/currentcallview.ui
index 7b9c8d1..e1d18ee 100644
--- a/ui/currentcallview.ui
+++ b/ui/currentcallview.ui
@@ -228,8 +228,7 @@
             <child>
               <object class="GtkToggleButton" id="togglebutton_muteaudio">
                 <property name="label" translatable="yes">Mute audio</property>
-                <!-- TODO: set visible when feature enabled -->
-                <property name="visible">False</property>
+                <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
                 <property name="action-name">app.mute_audio</property>
@@ -242,8 +241,7 @@
             <child>
               <object class="GtkToggleButton" id="togglebutton_mutevideo">
                 <property name="label" translatable="yes">Mute video</property>
-                <!-- TODO: set visible when feature enabled -->
-                <property name="visible">False</property>
+                <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
                 <property name="action-name">app.mute_video</property>