adding text output for battery stats wipe. just a confirmation that it completed successfully

Change-Id: I8c00521081b12f123c35239212f2b53dde3a7c8e
diff --git a/extendedcommands.c b/extendedcommands.c
index ec4ddc7..a03a1b7 100644
--- a/extendedcommands.c
+++ b/extendedcommands.c
@@ -862,6 +862,7 @@
     ensure_path_mounted("/data");
     remove("/data/system/batterystats.bin");
     ensure_path_unmounted("/data");
+    ui_print("Battery Stats wiped.\n");
 }
 
 void show_advanced_menu()