test: explicitly add ie 11 to targets in tests

As the default target of browerslist now changes, the tests can no
longer reflect their original intentions unless explicitly targeting
IE 11.

packages/@vue/babel-preset-app/__tests__/babel-preset.spec.js

@@ -3,7 +3,11 @@ const babel = require('@babel/core')
 const preset = require('../index')
 const defaultOptions = {
   babelrc: false,
-  presets: [preset],
+  presets: [[preset, {
+    targets: {
+      ie: '11'
+    }
+  }]],
   filename: 'test-entry-file.js'
 }
 
@@ -161,7 +165,8 @@ test('disable absoluteRuntime', () => {
   `.trim(), {
     babelrc: false,
     presets: [[preset, {
-      absoluteRuntime: false
+      absoluteRuntime: false,
+      targets: { ie: '11' }
     }]],
     filename: 'test-entry-file.js'
   })
@@ -183,7 +188,8 @@ test('should inject polyfills / helpers using "require" statements for a umd mod
   `.trim(), {
     babelrc: false,
     presets: [[preset, {
-      absoluteRuntime: false
+      absoluteRuntime: false,
+      targets: { ie: '11' }
     }]],
     filename: 'test-entry-file.js'
   })
@@ -200,7 +206,8 @@ test('should inject polyfills / helpers using "import" statements for an es modu
   `.trim(), {
     babelrc: false,
     presets: [[preset, {
-      absoluteRuntime: false
+      absoluteRuntime: false,
+      targets: { ie: '11' }
     }]],
     filename: 'test-entry-file.js'
   })
@@ -217,7 +224,8 @@ test('should not inject excluded polyfills', () => {
     babelrc: false,
     presets: [[preset, {
       exclude: ['es.promise'],
-      polyfills: ['es.array.iterator', 'es.object.assign']
+      polyfills: ['es.array.iterator', 'es.object.assign'],
+      targets: { ie: '11' }
     }]],
     filename: 'test-entry-file.js'
   })