Fixed bug due to reading bytes without considering byte order.

There was one little piece left in the Plot3D reader where
the raw bytes were not being converted to the right byte order.
Fixed.

Change-Id: I4011221ede5a9567ed1ff55436fcc0cadad23f15
Merge topic 'fixed-endianness-bug' into master

68739e24 Fixed bug due to reading bytes without considering byte order.