Fix file mode and bad variable

prepare_remote_script.py

@@ -115,7 +115,7 @@ def user_action(hunk: Sequence[Command], context=None) -> Sequence[Command]:
 	def stringify_hunk(hunk):
 		result = ''
 		for cmd in hunk:
-			global host
+			host = 'unknown'
 			result += f'SSH: {cmd.user}@{host} {cmd.directory} $ {cmd.command}\n'
 		return result
 
@@ -176,7 +176,7 @@ def user_action(hunk: Sequence[Command], context=None) -> Sequence[Command]:
 def run_command(cmd: Command):
 	# Save the SSH command.
 	global target_filename
-	with open(target_filename, "w+") as target:
+	with open(target_filename, "a+") as target:
 		target.write(f"{cmd.user if cmd.user else ''}\t{cmd.directory if cmd.directory else ''}\t{cmd.command}\n")