Use more standard Unicode notations in keyboard layout resource files.

bug: 5988656
Change-Id: Ie2416ccd790f29934a37e9dc77d7525e5113048a
diff --git a/java/res/drawable/background_voice.xml b/java/res/drawable/background_voice.xml
index 3b6137d..49a4191 100644
--- a/java/res/drawable/background_voice.xml
+++ b/java/res/drawable/background_voice.xml
@@ -22,4 +22,4 @@
         android:startColor="#ff000000"
         android:endColor="#ff000e29"
         android:angle="90" />
-</shape>
\ No newline at end of file
+</shape>