tools/mpremote: Add ctrl-x as additonal mpremote disconnect shortcut.

The mpremote REPL can now be closed with either ctrl+] or ctrl+x, which
gives users a choice, useful if the ']' key is difficult to access.

Fixes issue #11197.
Signed-off-by: Jonas Scharpf <jonas@brainelectronics.de>

tools/mpremote/mpremote/repl.py

@@ -8,7 +8,7 @@ def do_repl_main_loop(state, console_in, console_out_write, *, code_to_inject, f
         console_in.waitchar(state.pyb.serial)
         c = console_in.readchar()
         if c:
-            if c == b"\x1d":  # ctrl-], quit
+            if c in (b"\x1d", b"\x18"):  # ctrl-] or ctrl-x, quit
                 break
             elif c == b"\x04":  # ctrl-D
                 # special handling needed for ctrl-D if filesystem is mounted
@@ -56,7 +56,7 @@ def do_repl(state, args):
     file_to_inject = args.inject_file
 
     print("Connected to MicroPython at %s" % state.pyb.device_name)
-    print("Use Ctrl-] to exit this shell")
+    print("Use Ctrl-] or Ctrl-x to exit this shell")
     if capture_file is not None:
         print('Capturing session to file "%s"' % capture_file)
         capture_file = open(capture_file, "wb")