Define "any" step value for "number" fields (#98)

This fixes validation for decimal values in number fields.

Author: dtrucs

src/ui.js

@@ -120,6 +120,7 @@ function FormField(props) {
                 inputProps.type = 'range';
             else
                 inputProps.type = 'number';
+                inputProps.step = 'any'
 
             InputField = FormInput;