Fix pep8

Author: misl6

pythonforandroid/recipes/kivy/__init__.py

@@ -48,7 +48,7 @@ def get_recipe_env(self, arch):
             env['KIVY_SDL2_PATH'] = ':'.join([
                 join(self.ctx.bootstrap.build_dir, 'jni', 'SDL', 'include'),
                 join(self.ctx.bootstrap.build_dir, 'jni', 'SDL2_image'),
-                join(self.ctx.bootstrap.build_dir, 'jni', 'SDL2_mixer','include'),
+                join(self.ctx.bootstrap.build_dir, 'jni', 'SDL2_mixer', 'include'),
                 join(self.ctx.bootstrap.build_dir, 'jni', 'SDL2_ttf'),
             ])