Small fix for "seams" appearing in generated noise

A few people have noticed this: generating noise with a moderate (4-10, in my experience) number of octaves could cause seams to appear in the noise at regular intervals. This was due to the octave interpolation using a regular lerp to interpolate between regions, rather than an interpolation of a higher-order. See [Wikipedia](C:\Users\drago\Utilities\Stuff I made\Macaw) for more on that if you’re interested.

Anyway, generated noise should appear more continuous. See the screenshots to see the same noise generated but without the visible seams.