style(Dialog): change background to surface (#3184)

Co-authored-by: Michael Marszalek <[email protected]>

Author: Barsnes

.changeset/three-humans-poke.md

@@ -0,0 +1,5 @@
+---
+"@digdir/designsystemet-css": patch
+---
+
+**Dialog**: Fix background to surface color variable

packages/css/src/dialog.css

@@ -1,6 +1,6 @@
 .ds-dialog {
   --dsc-dialog-backdrop-background: rgb(0 0 0 / 0.5);
-  --dsc-dialog-background: var(--ds-color-neutral-background-default);
+  --dsc-dialog-background: var(--ds-color-neutral-surface-default);
   --dsc-dialog-icon-spacing: var(--ds-size-3);
   --dsc-dialog-icon-url: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1em' height='1em' fill='none' viewBox='0 0 24 24' focusable='false' role='img'%3E%3Cpath fill='currentColor' d='M6.53 5.47a.75.75 0 0 0-1.06 1.06L10.94 12l-5.47 5.47a.75.75 0 1 0 1.06 1.06L12 13.06l5.47 5.47a.75.75 0 1 0 1.06-1.06L13.06 12l5.47-5.47a.75.75 0 0 0-1.06-1.06L12 10.94z'%3E%3C/path%3E%3C/svg%3E");
   --dsc-dialog-color: var(--ds-color-neutral-text-default);