Update devcontainer.json

Author: Chuxel

containers/dotnetcore-latest/.devcontainer/devcontainer.json

@@ -1,8 +1,8 @@
 {
-	"name": ".C# (.NET Core Latest)",
+	"name": "C# (.NET Core Latest)",
 	"dockerFile": "Dockerfile",
 	"appPort": 8090,
 	"extensions": [
 		"ms-vscode.csharp"
 	]
-}
+}