Update locked icon

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

app/src/main/res/drawable/ic_vpn_key_black_24dp.xml → app/src/main/res/drawable/ic_lock_white_24px.xml

@@ -2,7 +2,7 @@
   ~ Nextcloud Talk application
   ~
   ~ @author Mario Danic
-  ~ Copyright (C) 2017 Mario Danic <mario@lovelyhq.com>
+  ~ Copyright (C) 2017-2018 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
@@ -21,5 +21,5 @@
 <vector android:autoMirrored="true" android:height="24dp"
     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="M12.65,10C11.83,7.67 9.61,6 7,6c-3.31,0 -6,2.69 -6,6s2.69,6 6,6c2.61,0 4.83,-1.67 5.65,-4H17v4h4v-4h2v-4H12.65zM7,14c-1.1,0 -2,-0.9 -2,-2s0.9,-2 2,-2 2,0.9 2,2 -0.9,2 -2,2z"/>
+    <path android:fillColor="#FFFFFF" android:pathData="M18,8h-1L17,6c0,-2.76 -2.24,-5 -5,-5S7,3.24 7,6v2L6,8c-1.1,0 -2,0.9 -2,2v10c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2L20,10c0,-1.1 -0.9,-2 -2,-2zM12,17c-1.1,0 -2,-0.9 -2,-2s0.9,-2 2,-2 2,0.9 2,2 -0.9,2 -2,2zM15.1,8L8.9,8L8.9,6c0,-1.71 1.39,-3.1 3.1,-3.1 1.71,0 3.1,1.39 3.1,3.1v2z"/>
 </vector>

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

@@ -49,7 +49,7 @@
             android:layout_width="20dp"
             android:layout_height="20dp"
             android:layout_gravity="bottom|end"
-            android:src="@drawable/ic_vpn_key_black_24dp"
+            android:src="@drawable/ic_lock_white_24px"
             android:tint="@color/nc_material_yellow"
             android:tintMode="src_in"
             android:visibility="visible"/>