st/mesa: Increase GL_ALIASED_POINT_SIZE_RANGE minimum to 1.0

Kenneth Graunke requested to merge kwg/mesa:st-minpointsize into master

The OpenGL ES 3.2 specification provides a means to query this value, GL_ALIASED_POINT_SIZE_RANGE. The minimum value in Table 21.40 says that the minimum value is 1, not zero. So, increase it to that.

Fixes the WebGL 2.0 conformance suite's test, which fails drivers that report a value less than 1.

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