Bugfix: temporary config filename

[ArneVoss]

Proposed Changes

Give a brief overview of your contribution here in a few sentences.

Using the python interface to modify the config file, it may happen that the temporary config file is accessed at once by multiple SU2 runs, leading to io conflicts. Thus, the name of the temporary file should not be hard-coded. This bugfix simply adds a '_tmp' to the original config file name.

Related Work

Resolve any issues (bug fix or feature request), note any related PRs, or mention interactions with the work of others, if any.

PR Checklist

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• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with the '-Wall -Wextra -Wno-unused-parameter -Wno-empty-body' compiler flags, or simply --warnlevel=2 when using meson).
• My contribution is commented and consistent with SU2 style.
• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp) , if necessary.

[pcarruscag]

Thanks LGTM

[pcarruscag]

Ah wait, special thanks, since it is your first contribution, add yourself to AUTHORS.md please.

[ArneVoss]

Ah wait, special thanks, since it is your first contribution, add yourself to AUTHORS.md please.

That's an honor, thank you!