JS: modify 'getValueTokens' for SampleInput to return nothing when isDefault is set
JS: modify 'getValueTokens' for SampleInput to return nothing when isDefault is set

Fixes a bug that caused an input to be cleared if it was equal to the
default value.

Signed-off-by: Harry King <409587b9e6671aa0763646191d292852dc49a658@gmail.com>

jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim