don't output \r char if stream is a file

Common/GmshMessage.cpp

@@ -470,7 +470,7 @@ void Msg::ProgressMeter(int n, int N, bool log, const char *fmt, ...)
     }
 #endif
 
-    if(log && CTX::instance()->terminal){
+    if(!streamIsFile(stdout) && log && CTX::instance()->terminal){
       fprintf(stdout, "%s                                          \r",
               (n > N - 1) ? "" : str2);
       fflush(stdout);