fix: Hide value label for opacity slider as well in color picker (#1212)

* Hide value label for opacity slider as well in color picker

* chore: linting

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Co-authored-by: Jacob Overgaard <752371+iOvergaard@users.noreply.github.com>

Author: bjarnef

packages/uui-color-picker/lib/uui-color-picker.element.ts

@@ -460,6 +460,7 @@ export class UUIColorPickerElement extends LabelMixin('label', LitElement) {
             ${this.opacity
               ? html`
                   <uui-color-slider
+                    hide-value-label
                     label="alpha"
                     class="opacity-slider"
                     .value=${Math.round(this.alpha)}