Fix truncation rules for base64 encoding

Commit e1d917182 added support for base64url encoding, a base64 variant
intended to be safe for usage in URLs and filenames.  The padding rules
for base64url and base64 differ in that base64url require no extra '='
padding, but the commit unintentionally relaxed this requirement for
base64 as well.  Fix by making sure that the truncation logic check
for the encoding and add a test to make sure.

Backpatch down to v19 where support for base64url was introduced.

Author: Daniel Gustafsson <[email protected]>
Reviewed-by: David E. Wheeler <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 19

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/1f414035135cca34b606d4c0d3db0eb57045e00b

Modified Files
--------------
src/backend/utils/adt/encode.c        | 4 ++--
src/test/regress/expected/strings.out | 4 ++++
src/test/regress/sql/strings.sql      | 3 +++
3 files changed, 9 insertions(+), 2 deletions(-)

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