Rename two local variables ssl to s for consistency

In our tls13_* files, we use SSL *s for local variables and SSL *ssl
for function arguments. This is odd, but probably the result of finger
memory. We intended to use ssl everywhere. Be that as it may, all local
variables except in two functions ended up being called s, so align the
two outliers with that.  As noted by jsing, this is not ideal either as
in tls13_legacy_servername_process() the ssl_ctx is now inconsistent.
Renaming all s to ssl is a substantial amount of unnecessary churn at a
moment that isn't ideal, so we have to live with that.

ok bcook inoguchi jsing

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