[1.5.x] Fixed #19453 -- Ensured that the decorated function's arguments are...

[1.5.x] Fixed #19453 -- Ensured that the decorated function's arguments are obfuscated in the @sensitive_variables decorator's frame, in case the variables associated with those arguments were meant to be obfuscated from the decorated function's frame.
Thanks to vzima for the report.
Backport of 9180146d