Minor typo fix and more consistent use of rand

I removed some re-definitions of rand that were pointless (as far as I can tell). I verified that tests in test_basic.py still pass in floatX=float32 and float64.

Minor typo fix and more consistent use of rand
dc71014c · Olivier Delalleau · 520ffd88 · dc71014c
--- a/theano/tensor/tests/test_basic.py
+++ b/theano/tensor/tests/test_basic.py