wire: respect -record flag for tests (google/go-cloud#282)

Fixes google/go-cloud#281

internal/wire/testdata/Cleanup/want/wire_gen.go

@@ -0,0 +1,17 @@
+// Code generated by Wire. DO NOT EDIT.
+
+//go:generate wire
+//+build !wireinject
+
+package main
+
+// Injectors from wire.go:
+
+func injectBar() (*Bar, func()) {
+	foo, cleanup := provideFoo()
+	bar, cleanup2 := provideBar(foo)
+	return bar, func() {
+		cleanup2()
+		cleanup()
+	}
+}