Fix problems in tramp-test33-environment-variables
* test/lisp/net/tramp-tests.el (tramp-test33-environment-variables):
Use ${parameter:-word} construct. Remove PS1 entry from
"printenv" output.
(tramp--test-check-files): Use "printenv".
* test/lisp/net/tramp-tests.el (tramp-test33-environment-variables):
Use ${parameter:-word} construct. Remove PS1 entry from
"printenv" output.
(tramp--test-check-files): Use "printenv".