Use more standard Unicode notations in keyboard layout resource files.

bug: 5988656
Change-Id: Ie2416ccd790f29934a37e9dc77d7525e5113048a
diff --git a/java/res/values-en/additional-proximitychars.xml b/java/res/values-en/additional-proximitychars.xml
index 0e12767..a5ff4a9 100644
--- a/java/res/values-en/additional-proximitychars.xml
+++ b/java/res/values-en/additional-proximitychars.xml
@@ -59,4 +59,4 @@
         <item></item>
     </string-array>
 
-</resources>
\ No newline at end of file
+</resources>