fix(NcCheckboxRadioSwitch): visually hidden input position

Otherwise it is not actually positioned on the label and moved away in scrollable container.
It also may scroll the container on click.

Signed-off-by: Grigorii K. Shartsev <me@shgk.me>

src/components/NcCheckboxRadioSwitch/NcCheckboxRadioSwitch.vue

@@ -609,6 +609,7 @@ export default {
 	font-size: var(--default-font-size);
 	line-height: var(--default-line-height);
 	padding: 0;
+	position: relative;
 
 	&__input {
 		position: absolute;