Fixed form switch when `enable-rounded` is `false`

scss/_variables-dark.scss

@@ -63,11 +63,7 @@ $form-select-indicator-color-dark:  $body-color-dark !default;
 $form-select-indicator-dark:        url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path fill='none' stroke='#{$form-select-indicator-color-dark}' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/></svg>") !default;
 
 $form-switch-color-dark:            rgba($white, .25) !default;
-@if $enable-rounded {
-  $form-switch-bg-image-dark:         url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='3' fill='#{$form-switch-color-dark}'/></svg>") !default;
-} @else {
-  $form-switch-bg-image-dark:         url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><rect x='-3' y='-3' width='6' height='6' fill='#{$form-switch-color-dark}'/></svg>") !default;
-}
+$form-switch-bg-image-dark:         if($enable-rounded, url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='3' fill='#{$form-switch-color-dark}'/></svg>"), url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><rect x='-3' y='-3' width='6' height='6' fill='#{$form-switch-color-dark}'/></svg>")) !default;
 
 // scss-docs-start form-validation-colors-dark
 $form-valid-color-dark:             $green-300 !default;