Make paths absolute in settings.gradle (#33228)

packages/flutter_tools/templates/module/android/host_app_editable/settings.gradle.copy.tmpl

@@ -2,4 +2,4 @@
 include ':app'
 
 setBinding(new Binding([gradle: this]))
-evaluate(new File('../.android/include_flutter.groovy'))
+evaluate(new File(settingsDir.parentFile, '.android/include_flutter.groovy'))

packages/flutter_tools/templates/module/android/host_app_ephemeral/settings.gradle.copy.tmpl

@@ -3,4 +3,4 @@ include ':app'
 
 rootProject.name = 'android_generated'
 setBinding(new Binding([gradle: this]))
-evaluate(new File('include_flutter.groovy'))
+evaluate(new File(settingsDir, 'include_flutter.groovy'))

packages/flutter_tools/templates/module/android/library/settings.gradle.copy.tmpl

@@ -2,4 +2,4 @@
 
 rootProject.name = 'android_generated'
 setBinding(new Binding([gradle: this]))
-evaluate(new File('include_flutter.groovy'))
+evaluate(new File(settingsDir, 'include_flutter.groovy'))

packages/flutter_tools/test/project_test.dart

@@ -126,7 +126,7 @@ void main() {
         expectExists(project.directory.childDirectory('.android').childDirectory('Flutter'));
         expect(
           project.directory.childDirectory('android').childFile('settings.gradle').readAsStringSync(),
-          contains('../.android/include_flutter.groovy'),
+          contains('new File(settingsDir.parentFile, \'.android/include_flutter.groovy\')'),
         );
       });
       testInMemory('can be redone after deletion', () async {