Bug 23399: Reindent returns.tt

Bug 23399: Reindent returns.tt

This patch reindents circulation/returns.tt to use four spaces,
following coding guidelines.

To test, apply the patch and use your preferred method for checking the
differences between files while ignoring whitespace. I use diff with the
"-w" flag, but each must take their own journey.

Test the checkin process to confirm that everything still works
correctly.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>