snap7: remove python call from test

[Moisan]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
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Related to #93940

[SMillerDev]

==> /usr/bin/gcc-5 -o test test.c -L/home/linuxbrew/.linuxbrew/Cellar/snap7/1.4.2_1/lib -lsnap7
/usr/bin/ld: cannot find -lsnap7

seems like an issue for another day

[BrewTestBot]

🤖 A scheduled task has triggered a merge.