imaplib: revert import reformatting

Since we no longer import platform or selectors, the original import
statement style can be restored, reducing the footprint of PR #122542.

Lib/imaplib.py

@@ -23,15 +23,7 @@
 
 __version__ = "2.59"
 
-import binascii
-import calendar
-import errno
-import random
-import re
-import socket
-import subprocess
-import sys
-import time
+import binascii, errno, random, re, socket, subprocess, sys, time, calendar
 from datetime import datetime, timezone, timedelta
 from io import DEFAULT_BUFFER_SIZE
 import warnings