Fix WallMakeMask for regions not overriding contains(x, z)

[SirYwell]

Overview

Description

For some region implementations, precise contains(x, z) implementations would require heavy computation, far more heavy than just also passing the Y coordinate. FuzzyRegion is a good example for that.
For such regions, //walls was broken before. This simple change addresses this problem.

Submitter Checklist

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[dordsor21]

Should the fix rather be to overload the contains(x,y,z) or to add them to the relevant regions?

[SirYwell]

Overriding contains(x, z) should probably be done too, but especially for FuzzyRegion there is no fast way to check whether any y coordinate is included, you'd have to go from minY to maxY potentially. For some other regions it's similarly complex. Generally I think the contains(x, z) method does not provide much benefit, maybe we should just deprecate it.