Per talkbackteam, please change point to " point "

Fixes b/6339309 Accessibility:- Calculator doesn't talk back any number or operation correctly.

Change-Id: I36da0604d9b743a91b085fa5f4b471e7e3a42aeb
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 9313894..a24cd4e 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -175,7 +175,7 @@
         <!-- Description for mathematical - [CHAR LIMIT=200]-->
         <item>minus</item>
         <!-- Description for mathematical . [CHAR LIMIT=200]-->
-        <item>point</item>
+        <item>&#160;point&#160;</item>
         <!-- Description for mathematical ^ [CHAR LIMIT=200]-->
         <item>power</item>
         <!-- Description for mathematical TAN [CHAR LIMIT=200]-->