Set voice button proxy as not important for accessibility.

Bug: 6441080
Change-Id: Ib6cfe87322ef283ff3adee8dccee1eb155cd531f
diff --git a/res/layout-port/launcher.xml b/res/layout-port/launcher.xml
index 6030382..91b1364 100644
--- a/res/layout-port/launcher.xml
+++ b/res/layout-port/launcher.xml
@@ -79,6 +79,7 @@
         android:layout_gravity="right"
         android:clickable="true"
         android:onClick="onClickVoiceButton"
+        android:importantForAccessibility="no"
         launcher:sourceViewId="@+id/voice_button" />
 
     <include layout="@layout/apps_customize_pane"