Fix SRTP s_client/s_server options

The -use_srtp s_client/s_server option is supposed to take a colon
separated string as an argument. In master this was incorrectly set to
expect a filename.
Reviewed-by: NRich Salz <rsalz@openssl.org>

apps/s_client.c

@@ -519,7 +519,7 @@ OPTIONS s_client_options[] = {
      "Load the file(s) into the random number generator"},
     {"sess_out", OPT_SESS_OUT, '>', "File to write SSL session to"},
     {"sess_in", OPT_SESS_IN, '<', "File to read SSL session from"},
-    {"use_srtp", OPT_USE_SRTP, '<',
+    {"use_srtp", OPT_USE_SRTP, 's',
      "Offer SRTP key management with a colon-separated profile list"},
     {"keymatexport", OPT_KEYMATEXPORT, 's',
      "Export keying material using label"},

apps/s_server.c

@@ -949,7 +949,7 @@ OPTIONS s_server_options[] = {
      "Set the advertised protocols for the NPN extension (comma-separated list)"},
 #endif
 #ifndef OPENSSL_NO_SRTP
-    {"use_srtp", OPT_SRTP_PROFILES, '<',
+    {"use_srtp", OPT_SRTP_PROFILES, 's',
      "Offer SRTP key management with a colon-separated profile list"},
     {"alpn", OPT_ALPN, 's',
      "Set the advertised protocols for the ALPN extension (comma-separated list)"},