pingpong: change repsonse timeout to one minute

It was previously two minutes by default and sometimes one minute.
Removes a struct field.

Closes #19254

lib/pingpong.h

@@ -53,8 +53,6 @@ struct pingpong {
   size_t sendsize; /* total size of the sendthis buffer */
   struct curltime response; /* set to Curl_now() when a command has been sent
                                off, used to time-out response reading */
-  timediff_t response_time; /* When no timeout is given, this is the amount of
-                               milliseconds we await for a server response. */
   struct dynbuf sendbuf;
   struct dynbuf recvbuf;
   size_t overflow; /* number of bytes left after a final response line */
@@ -75,7 +73,6 @@ struct pingpong {
 
 #define PINGPONG_SETUP(pp,s,e)                   \
   do {                                           \
-    (pp)->response_time = RESP_TIMEOUT;          \
     (pp)->statemachine = s;                      \
     (pp)->endofresp = e;                         \
   } while(0)