input widgets do not remember previously entered values

[ctrueden]

In ImageJ2, when executing a SciJava module and harvesting the inputs, the SaveInputsPreprocessor takes care to persist the values, and the LoadInputsPreprocessor takes care to read and populate them the next time the module is run. Something about the way napari-imagej is executing modules does not behave the same, because when I run Example_Script.js for example, the values all always start at null/null-approximate (0 for numeric primitives, false for primitive booleans).