Fix one more instance of unspecified include in tsconfig. (#47207)

packages/js/experimental/changelog/47207-dev-fix-experimental-tsconfig

@@ -0,0 +1,4 @@
+Significance: patch
+Type: dev
+Comment: Fix a persistent build bug where TS would try compile files outside of src and typings in packages/js/experimental
+

packages/js/experimental/tsconfig.json

@@ -1,5 +1,6 @@
 {
 	"extends": "../tsconfig",
+	"include": [ "src/", "typings/" ],
 	"compilerOptions": {
 		"rootDir": "src",
 		"outDir": "build-module",
@@ -7,9 +8,6 @@
 		"declaration": true,
 		"declarationMap": true,
 		"declarationDir": "./build-types",
-		"typeRoots": [
-			"./typings",
-			"./node_modules/@types"
-		]
+		"typeRoots": [ "./typings", "./node_modules/@types" ]
 	}
 }