minorbug(dd): status= errors not quoted

[HackingRepo]

Hi, uutils mainteners

we confirmed that when analyzing errors that not quoted

relunsec@relunsec:~/software/coreutils/target/debug$ ./dd status=$'\x01'
dd: status=LEVEL not recognized -> 
relunsec@relunsec:~/software/coreutils/target/debug$ gnudd iflag=$'\x01'
gnudd: invalid input flag: ‘\001’
Try 'gnudd --help' for more information.
relunsec@relunsec:~/software/coreutils/target/debug$