Fix USERNAME env variable not set correctly

USERNAME environment variable is set correctly with the remote logged on
username.

Author: quamrulmina

session.c

@@ -591,6 +591,7 @@ do_exec_no_pty(Session *s, const char *command)
   si.lpDesktop = L"winsta0\\default";
 
   SetEnvironmentVariable("USER", s->pw->pw_name);
+  SetEnvironmentVariable("USERNAME", s->pw->pw_name);
   SetEnvironmentVariable("LOGNAME", s->pw->pw_name);
 
   /*
@@ -1206,7 +1207,7 @@ do_exec_pty(Session *s, const char *command)
    */
 
   //return 0;
-  return do_exec_pty(s, command);
+  return do_exec_no_pty(s, command);
 
 #endif 
 }