perf tests: Fix 'perf report' tests installation

There was a copy-paste mistake in the installation commands.

Also, we need to install stderr-whitelist.txt file, which contains
allowed messages that are printed on stderr and should not cause test
fail.

Fixes: 097fe67d ("perf testsuite: Install perf-report tests in the 'make install-tests -C tools/perf' target")
Signed-off-by: Michael Petlan <mpetlan@redhat.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20250113182605.130719-6-vmolnaro@redhat.com


Signed-off-by: Veronika Molnarova <vmolnaro@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>