FIX LCMV flat normal orientation bug

The bug that made the LCMV normal orientation results flat turned out to be very simple (I just wish I had realized that on Saturday!) - when picking the normal orientation we set `is_free_ori = False`, but the code for running noise normalization `if not is_free_ori` was run just above, so the normal orientation data wasn't noise normalized.

I'm guessing I didn't pick up on it because of a stale binary, i.e. I rerun `make html` to get the docs and check if the example is ok after moving around the normal orientation picking code, but the docs compiled and the examples run with an older version of the code, so I didn't pick up on the bug.