[committed] Add missing cleanup in gfortran.dg/pr37287-1.f90

[Tom de Vries]

Hi,

After running gfortran tests, I found a pr37287_2.mod in my test directory.
Fixed by this patch which adds a missing cleanup-modules.

Tested by running the testcase and checking that the file does not occur anymore 
in the test directory.

Committed as obvious.

Thanks,
- Tom
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