change Aplus test mass RoCs to those of aLIGO

Open Kevin Kuns requested to merge kevin.kuns/pygwinc:fix_Aplus_RoCs into master

Changes the A+ test mass RoC's to those of aLIGO: 1934 m for the ITMs and 2245 m for the ETMs.

There was some discussion a year ago in #52 (closed) about not updating this, but these are the design values.

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