fix(picker): update default background-color to gray-50

Author: marissahuysentruyt

components/picker/themes/spectrum-two.css

@@ -13,7 +13,7 @@
 
 @container style(--system: spectrum) {
 	.spectrum-Picker {
-		--spectrum-picker-background-color-default: var(--spectrum-gray-100);
+		--spectrum-picker-background-color-default: var(--spectrum-gray-50);
 		--spectrum-picker-background-color-default-open: var(--spectrum-gray-100);
 		--spectrum-picker-background-color-hover: var(--spectrum-gray-200);
 		--spectrum-picker-background-color-hover-open: var(--spectrum-gray-200);