multi: remove total timer reset in file_do() while fetching file://

The total timer is properly reset in MSTATE_INIT.  MSTATE_CONNECT starts
with resetting the timer that is a start point for further multi states.
If file://, MSTATE_DO calls file_do() that should not reset the total
timer.  Otherwise, the total time is always less than the pre-transfer
and the start transfer times.

Closes #12682

lib/file.c

@@ -419,8 +419,6 @@ static CURLcode file_do(struct Curl_easy *data, bool *done)
 
   *done = TRUE; /* unconditionally */
 
-  Curl_pgrsStartNow(data);
-
   if(data->state.upload)
     return file_upload(data);