Add the actual icons

Signed-off-by: Mario Danic <mario@lovelyhq.com>

app/src/main/res/drawable/ic_volume_mute_white_24dp.xml

@@ -0,0 +1,25 @@
+<!--
+  ~ Nextcloud Talk application
+  ~
+  ~ @author Mario Danic
+  ~ Copyright (C) 2017-2019 Mario Danic <mario@lovelyhq.com>
+  ~
+  ~ This program is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation, either version 3 of the License, or
+  ~ at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~ GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#FFFFFF" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M7,9v6h4l5,5V4l-5,5H7z"/>
+</vector>

app/src/main/res/layout/controller_call.xml

@@ -155,7 +155,7 @@
             <com.facebook.drawee.view.SimpleDraweeView xmlns:app="http://schemas.android.com/apk/res-auto"
                 android:id="@+id/callControlEnableSpeaker"
                 app:backgroundImage="@color/colorPrimary"
-                app:placeholderImage="@drawable/ic_volume_up_white_24dp"
+                app:placeholderImage="@drawable/ic_volume_mute_white_24dp"
                 app:roundAsCircle="true"
                 android:layout_width="60dp"
                 android:layout_height="60dp"