Fix module_api-smoketest by using %target-swift-ide-test

Author: weliveindetail

test/IDE/module_api_smoketest.swift

@@ -1,5 +1,5 @@
 // RUN: %empty-directory(%t)
-// RUN: %swift-ide-test -generate-module-api-description -- -target %target-triple -module-cache-path %t %s | %FileCheck %s
+// RUN: %target-swift-ide-test -generate-module-api-description -module-cache-path %t %s | %FileCheck %s
 
 public struct Struct1 {}