Check full partition name for creation

Checks the full partition name/prefix for localstorage key-value pairs. This prevents the following situation that's currently reachable:

<code>db_helloworld!foo</code> already exists in localStorage,

<code>db_hello</code> is created, and

<code>db_hello</code> contains the key <code>db_helloworld!foo</code> because the namespace "db_helloworld" contains the substring "db_hello" and does not check against the full db name, causing the new db to push the existing <code>db_helloworld!foo</code> key to <code>_keys</code>.