send-email: expand path in sendemail.smtpsslcertpath config

As it says in the name, the SSL certificate path is a path so treat it
as one and support tilde-expansion.

Signed-off-by: John Keeping <john@keeping.me.uk>
Signed-off-by: Jeff King <peff@peff.net>

git-send-email.perl

@@ -239,7 +239,6 @@ sub do_edit {
     "smtpserveroption" => \@smtp_server_options,
     "smtpuser" => \$smtp_authuser,
     "smtppass" => \$smtp_authpass,
-    "smtpsslcertpath" => \$smtp_ssl_cert_path,
     "smtpdomain" => \$smtp_domain,
     "smtpauth" => \$smtp_auth,
     "to" => \@initial_to,
@@ -259,6 +258,7 @@ sub do_edit {
 
 my %config_path_settings = (
     "aliasesfile" => \@alias_files,
+    "smtpsslcertpath" => \$smtp_ssl_cert_path,
 );
 
 # Handle Uncouth Termination