angular-schema-form doesn't apply "step" attribute
for number type input.
To increase the number properly in the form by form control,
"step" attribute should be applied to number type input.
e.g.) if set 0.1 to step, form control will be increase the number
as 0.1->0.2->0.3... or decrease it as 1->0.9->0.8... .
This patch fixes it.
Change-Id: Ie837b605f281001ae209e743ea50b25a091dd752
Closes-Bug: #1698086
bf50752a16