MINOR: sample: make all bits random on the rand() sample fetch

MINOR: sample: make all bits random on the rand() sample fetch

The rand() sample fetch supports being limited to a certain range, but
it only uses 31 bits and scales them as requested, which means that when
the requested output range is larger than 31 bits, the least significant
one is not random and may even be constant.

Let's make use of the whole 32 bits now that we have access ot them.