SystemUI: HotspotTile: Don't reset the number of connected clients

This seems to be a cherry-pick error, since this line of code wasn't
in the original cm-13.0 commit: 983893dd.

This resulted in the hotspot QS tile occasionally displaying
'0 clients' instead of the actual number of clients connected.

Change-Id: I3e7621e4c7ddcde7e1925f0aa8c44d364c706099
Reported-by: Nikolay Jeliazkov <&lt;nijel8@gmail.com>