Fixing screen output for thermo-based NS initialization

[WallyMaier]

Proposed Changes

This simply adds a quick calculation so the proper value of Reynolds number is displayed when INIT_OPTION=TD_CONDITIONS.

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]

LGTM