bxx: Fixed type-conversion in randu<t>(...).
bxx: Fixed type-conversion in randu<t>(...).

Previous commit introduced an error in randu, producing 0 and 1
instead of the range [0,1].

bh107/bohrium,bh107/bohrium,bh107/bohrium,madsbk/bohrium,madsbk/bohrium,madsbk/bohrium,madsbk/bohrium,bh107/bohrium