science/py-scipy: Remove the recently added USES=blaslapack:openblas because LIB_DEPENDS=libblas.so:math/blas provides blas

It does build with libblas.so:math/blas, but doesn't with blaslapack:openblas.

PR: 251718
Reported by: thierry
Approved by: python (correction of the previous recent commit r559036)