Bug 21208: Fix housebound deliverer/chooser names

Bug 21208: Fix housebound deliverer/chooser names

When creating a housebound visit, the names of the chooser and deliverer are the
same as the housebound patron (even though the housebound patron does not have
chooser and deliverer roles).

It has been caused by:
  commit 5f80977875ff124d411f2cd89de4a944fa9c27af
  Bug 18403: Use patron-title.inc when hidepatronname is used
patron-title.inc now starts looking for a variable named "patron", which exists in
members/housebound.
A better fix could be to renamed this "patron" variable tested by
patron-title.inc, but at first glance it's the only place this issue
exists.

Test plan:
1- Make sure HouseboundModule is enabled in system preferences
2- Go to a patron file (Patron A)
3- Edit this patron's housebound roles to Chooser
4- Go to another patron file (Patron B)
5- Edit this patron's housebound roles to Deliverer
6- Go to a third patron's file (Patron C)
7- Go to the Housebound tab
8- Fill out the housebound profile for Patron c
9- Click on "Add a new delivery"
10- Fill out day and time
11- Check the Chooser drop down
12- Check the Deliverer drop down
13- Save the delivery
14- Notice the Chooser and Deliverer names are correct
15- Click on the name of the Chooser, it goes to Patron A's file
16- Go back and click on the name of the Deliverer, it goes to Patron B's file

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>