st/mesa: Increase GL_ALIASED_POINT_SIZE_RANGE minimum to 1.0
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 state.gl-get-calls test, which fails drivers that report a value less than 1.