Revert qr tests

Reference issue

What does this implement/fix?

boostmultiprec.cpp (perhaps others) refers to tests defined in qr_colpivoting.cpp and qr_fullpivoting.cpp, which were changed to include a permutation index type template parameter. The original tests (without the static assert that the permutation index must be int) will work as the default permutation index type is defined in FwdDeclarations.h.

Additional information