fix: change toolbar background to transparent

Author: Diaan

.changeset/modern-dots-invite.md

@@ -0,0 +1,5 @@
+---
+'@sl-design-system/tool-bar': patch
+---
+
+Changed toolbar background to transparent so it can be used on any background color

packages/components/tool-bar/src/tool-bar.scss

@@ -1,6 +1,6 @@
 :host {
   align-items: center;
-  background: var(--sl-elevation-surface-raised-default);
+  background: transparent;
   border: var(--sl-size-borderWidth-default) solid var(--sl-color-border-plain);
   border-radius: var(--sl-size-borderRadius-default);
   display: flex;