Fix unreachable scalar fast-path in RandomState.uniform

[vlad-perevezentsev]

This PR fixes a scalar fast-path in RandomState.uniform that was never reached.
The vec_cont2_array_sc(...) call was wrongly indented inside the if flow >= fhigh block, so scalar bounds fell through to the array path and returned 0-d ndarray instead of a Python float

import mkl_random

# Before
mkl_random.uniform(0.0, 1.0)
# array(0.13436424)

# Now
mkl_random.uniform(0.0, 1.0)
# 0.13436424476094544

[antonwolfy]

Thank you @vlad-perevezentsev