For SipDemo sample code:  Changed chosen image for "selected" state of
talk button

Change-Id: I723c5e1e468dcbbda8e268afe7d3dd619d4242f6
diff --git a/samples/SipDemo/res/drawable/btn_record.xml b/samples/SipDemo/res/drawable/btn_record.xml
index a803da1..e7980e9 100644
--- a/samples/SipDemo/res/drawable/btn_record.xml
+++ b/samples/SipDemo/res/drawable/btn_record.xml
@@ -17,7 +17,7 @@
 
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_pressed="true" android:drawable="@drawable/btn_speak_pressed" />
-    <item android:state_selected="true" android:drawable="@drawable/btn_speak_pressed" />
+    <item android:state_selected="true" android:drawable="@drawable/btn_speak_selected" />
     <item android:drawable="@drawable/btn_speak_normal" />
 </selector>