Facet not rendered if slider step is decimal

@johathan_hunt This was probably causes by the fact that the modulo calculation in \Drupal\facets_range_dropdowns\Plugin\facets\processor\RangeProcessor::getMinMax() was not working for for floating point step sizes that give a 0 when converted to integer (which then leads to a division by zero error). In 🐛 Count only includes results that exactly match the value Active the simple module calculation (%) has been replaced with floating point module calculation (fmod()). I expect that to fix this issue too. Can you confirm?