Remove the temporary SUID warning

A temporary SUID detection that would cause sway to exit was introduced
when SUID operation was deprecated, intended to avoid cases where a user
would not heed the deprecation notice, continued to use SUID and ended
up with sway accidentally running as root.

Remove the check, as the three years that have passed is sufficient time
for users to discover the deprecation and adapt. We did not care if
users intentionally want to run sway as root through SUID, we only
wanted to avoid surprise root.

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