selftests/bpf: Clean up call sites of stdio_restore()

reset_affinity() and save_ns() are only called in run_one_test(). There is
no need to call stdio_restore() in reset_affinity() and save_ns() if
stdio_restore() is moved right after a test finishes in run_one_test().

Also remove an unnecessary check of env.stdout_saved in crash_handler()
by moving env.stdout_saved assignment to the beginning of main().

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://patch.msgid.link/20250305182057.2802606-1-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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