makefiles/tools/serial: disable picocom local echo #11102
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Contribution description
#10630 fixed local echo in the shell. That being broken was the only reason to enable local echo in the first place. Thus I suggest disabling it, which this PR does for picocom.
Testing procedure
Run tests/shell on a newlib board with RIOT_TERMINAL=picocom, see double echo in master, single echo with this PR.
Issues/PRs references
#10630.