copy apk file from correct path (#432)

after using build tools 27.0.1, the output apk file path changed

Author: minggo

plugins/plugin_compile/build_android.py

@@ -583,7 +583,7 @@ def do_build_apk(self, build_mode, no_apk, output_dir, custom_step_args, android
             if project_name is None:
                 # use default project name
                 project_name = 'app'
-            gen_apk_folder = os.path.join(self.app_android_root, 'app/build/outputs/apk')
+            gen_apk_folder = os.path.join(self.app_android_root, 'app/build/outputs/apk', build_mode)
         else:
             assets_dir = os.path.join(self.app_android_root, "assets")
             project_name = self._xml_attr(self.app_android_root, 'build.xml', 'project', 'name')