Small modifications to speedup ViewContactActivity

Bug:2546767
 - Use query parameter instead of sql string concatenation
 - Try to use the ContactID that is passed in the Intent; fallback to lookup key if it is wrong (saves up to 2 queries)
 - Initialize the newEntities list directly with the correct length

Change-Id: Iab271f9b30a10fb23a50cd9feba831c72cfd994f