Gwt listing pages - HtmlEncoded the the Value string.

A24Group/Triage#5165

## Ready for review, test
## Testing Instructions
* Login to staffshift navigated to each of the listing pages below.
* Try and add `<b> <di break it` to any text box you can find on add page and save the collection object by clicking on add/Create/save button.
* Navigate back to the same listing page and check that the datagrid shows the value for the fields you entered as `<b> <di break it`.
* If any of the page Does not support `<b> <di break it` as a value to the fields that are visible on the datagrid go in the database and update the collection where the data for that datagrid is stored and set the value of the field as `<b> <di break it`  and refresh the front end and verify.
* Perform the test for all the scenario listed below

## Testing Scenarios:

__Organisation Context__
- [x] Vacancy Listing
- [x] User Listing
- [x] Group listing
- [x] Site Listing
- [x] Ward Listing
- [x] Order Listing
- [x] Agencies listing
- [x] Attendance (timesheets) listing

__Agency Context__
- [x] Vacancy Listing
- [x] User Listing
- [x] Branch Listing
- [x] Candidate Listing
- [x] Group listing
- [x] Clients listing
- [x] Client Site listing
- [x] Agency Order listing
- [x] Attendance listing

__System Admin Context__
- [x] Organisation Listing 
- [x] Agency Listing
- [x] Candidate Listing
- [x] User Listing
- [x] Invite listing 
- [x] Ward Listing
- [x] Site Listing 

__Candidate Context__
- [x] Attendance listing