Update modal border color to use custom variable instead of VSCode widget border

Author: robertpiosik

packages/ui/src/components/editor/panel/modals/Modal/Modal.module.scss

@@ -84,8 +84,7 @@
   max-width: 320px;
   color: var(--vscode-quickInput-foreground);
   background-color: var(--vscode-quickInput-background);
-  border: 1px solid var(--vscode-widget-border);
-  box-shadow: 0 0 8px 2px var(--vscode-widget-shadow);
+  border: 1px solid var(--cwc-border-color);
 
   &--full-width {
     max-width: none;