Small alignment of prompt attachment button

For microsoft#13572

Use consistent icon and don't add border

Author: mjbvz

src/vs/workbench/contrib/chat/browser/attachments/promptAttachments/promptAttachmentWidget.ts

@@ -157,7 +157,8 @@ export class PromptAttachmentWidget extends Disposable {
 				},
 			),
 		);
-		removeButton.icon = Codicon.x;
+
+		removeButton.icon = Codicon.close;
 		this.renderDisposables.add(removeButton.onDidClick((e) => {
 			e.stopPropagation();
 			this.model.dispose();

src/vs/workbench/contrib/chat/browser/media/chat.css

@@ -1042,14 +1042,6 @@ have to be updated for changes to the rules above, or to support more deeply nes
 	border-style: dashed;
 	opacity: 0.75;
 }
-.chat-attached-context .chat-prompt-attachment .monaco-button {
-	border-left: 1px solid var(--vscode-chat-requestBorder, var(--vscode-input-background, transparent));
-	margin-left: 3px;
-}
-.chat-attached-context .chat-prompt-attachment.error .monaco-button,
-.chat-attached-context .chat-prompt-attachment.warning .monaco-button {
-	border-left-color: currentColor;
-}
 .chat-attached-context .chat-prompt-attachment:focus .monaco-button {
 	border-color: var(--vscode-focusBorder);
 }