fix(RelativeRangeDatePicker): pass popupClassName into popup component (#113)

Co-authored-by: Aleksandr Burobin <lxndr-b@yandex-team.ru>

Author: lxndr

src/components/RelativeRangeDatePicker/RelativeRangeDatePicker.tsx

@@ -243,7 +243,7 @@ export function RelativeRangeDatePicker(props: RelativeRangeDatePickerProps) {
                 }}
                 anchorRef={anchorRef}
                 isMobile={isMobile}
-                className={props.className}
+                className={props.popupClassName}
             />
         </div>
     );