revert file icon edit

Author: eleanorjboyd

src/features/views/treeViewItems.ts

@@ -213,8 +213,7 @@ export class ProjectItem implements ProjectTreeItem {
         item.description = this.project.description;
         item.tooltip = this.project.tooltip;
         item.resourceUri = project.uri.fsPath.endsWith('.py') ? this.project.uri : undefined;
-
-        item.iconPath = this.project.iconPath;
+        item.iconPath = this.project.iconPath ?? (project.uri.fsPath.endsWith('.py') ? ThemeIcon.File : undefined);
         this.treeItem = item;
     }