refactor(pmjs): unify quitting by EOFError

`pyreadline3` on Windows would throw `Readline internal error` if calling `sys.exit` directly inside the REPL loop

Author: Xmader

python/pythonmonkey/cli/pmjs.py

@@ -191,8 +191,7 @@ def sigint_handler(signum, frame):
 
         got_sigint = got_sigint + 1
         if (got_sigint > 1):
-            sys.stdout.write("\n")
-            quit()
+            raise EOFError
 
         if (inner_loop != True):
             if (got_sigint == 1 and len(readline.get_line_buffer()) == readline_skip_chars):