Disabling validation of the tenancy start date

As per ticket 66932252
Reverting back all the 'no's to 'No's

There was only one exception where the *No* value was turned into a
lowercase 'no'. The fix would've been to revert only that change.  But
since all the 'No's (uppercase) were turned into 'no's (lowercase), this
change reverts them back to the correct state. As all the 'Yes' options
are already capitalised in the views as well as in the PDF. The same
applies to the 'No' (options).
Updated the PDF form

All the checkbox options are following the same convention, they are all
capitalised now. Before it was a mixture of capitalised & not
capitalised.
Fix for demoted_tenancy field in the PDF form
Fix for possession_hearing PDF form field

Prepopulated PDF added
Merge pull request #112 from ministryofjustice/66932252/disable-tenancy-start-date-validation

Disabling validation of the tenancy start date