fix(b-form-spinbutton): respect step value for initial decrement when `wrap` enabled (closes #4884) (#4885)
fix(b-form-spinbutton): respect step value for initial decrement when `wrap` enabled (closes #4884) (#4885)

* fix(b-form-spinbutton): respect step value when decrementing (closes #4884)

* Update form-spinbutton.js

Co-authored-by: Jacob Müller <7ae9a40946a993a46e3f1d4a8ac589d2efe9da89@gmail.com>

bootstrap-vue/bootstrap-vue,bootstrap-vue/bootstrap-vue