dev/core#2035 Invoice template - show Amount paid even when it is fully paid

dev/core#2035 Invoice template - show Amount paid even when it is fully paid

In https://github.com/civicrm/civicrm-core/pull/16680/files?w=1#diff-b211e0dac858fdad5d480c118d645e0bR129 there was a change from
'show amount paid & due depending on pay-later status' to 'show amount paid & due depending on whether payment is due'

This has been experienced as a regression and, being an invoice, there seems no reason to only change it sometimes.

This change just alters the template that new installs will receive. If approved another step is needed to update existing
installs (unless they have customised the template)