fix(picker): update default border-color to gray-500

Author: marissahuysentruyt

components/picker/themes/spectrum-two.css

@@ -20,7 +20,7 @@
 		--spectrum-picker-background-color-active: var(--spectrum-gray-200);
 		--spectrum-picker-background-color-key-focus: var(--spectrum-gray-200);
 
-		--spectrum-picker-border-color-default: var(--spectrum-gray-800);
+		--spectrum-picker-border-color-default: var(--spectrum-gray-500);
 		--spectrum-picker-border-color-default-open: var(--spectrum-gray-500);
 		--spectrum-picker-border-color-hover: var(--spectrum-gray-600);
 		--spectrum-picker-border-color-hover-open: var(--spectrum-gray-900);