boards/native: only use pyterm wrapper with term target

[benpicco]

Contribution description

Only enable the pyterm wrapper if we are executing the term target to avoid breaking things.

Testing procedure

make debug should work again on native.
So does e.g. tests/sys/log_color without the previously added workaround.

Issues/PRs references

reverts #20215
fixes #20265

[riot-ci]

Murdock results

✔️ PASSED

e5618f7 boards/native: set and test for pyterm explicitly

Success	Failures	Total	Runtime
8623	0	8623	12m:28s

Artifacts

• Documentation preview

[OlegHahm]

I don't understand the fix. Currently nativeis set as RIOT_TERMINAL in various tests (independent of the Make target). So wouldn't this change just additionally set it if it has not been set but still use it for, e.g., make debug if set as is in the tests?

[benpicco]

The idea was to only use pyterm on native when the target is term to avoid interfering with other targets (test, debug, valgrind, …) and not having to play whack-a-mole.

That's why this also reverts the change to always use native term for the test target because now it should now always be used except for the term target.