leave the padding on the backupkeys

this was self-consistent on the device, but the host tool
treats lack of padding in a different way.

Bug:10778984
Change-Id: I47f653a98f23ff0ce54218d100e0c8e2f92b67fa
diff --git a/src/com/android/launcher3/LauncherBackupAgent.java b/src/com/android/launcher3/LauncherBackupAgent.java
index cb0dd49..4d06f9c 100644
--- a/src/com/android/launcher3/LauncherBackupAgent.java
+++ b/src/com/android/launcher3/LauncherBackupAgent.java
@@ -644,7 +644,7 @@
 
     /** keys need to be strings, serialize and encode. */
     private String keyToBackupKey(Key key) {
-        return Base64.encodeToString(Key.toByteArray(key), Base64.NO_WRAP | Base64.NO_PADDING);
+        return Base64.encodeToString(Key.toByteArray(key), Base64.NO_WRAP);
     }
 
     /** keys need to be strings, decode and parse. */