* use-package-core.el (use-package): fix declare style

* use-package-core.el (use-package): fix declare style

use-package specified lisp-indent-function to indent like defun.

Currently, use-package main macro specify indent as (declare (indent 1)),
then change indent mode like defun.

(declare (indent defun)) is same effect.
And it is useful when redefining use-package.