Split Truchas reader test into two versions
One version is for when VisItBridge is enabled, one version is for when VisItBridge is not enabled. VisItBridge adds several readers that say they can read .h5 files like the Truchas reader, hence the test needs to pick the Truchas reader from the reader selection dialog. Without VisItBridge enabled, the Truchas reader will be used automatically.
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