Update prebuilt/preferences/pa_hdpi/pref_2.xml

Missing closing </property> tag from pref_2.xml, all others are fine.

Updated with this change and working fine on the no-wifi build, posted this under my xda nic of AussieLambchops but I don't know if you saw the post before it got pushed back a few pages.
Merge pull request #1 from xLaMbChOpSx/patch-1

Update prebuilt/preferences/pa_hdpi/pref_2.xml