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is used by mh-image-load-path so that it runs only once.
(mh-image-load-path): Modified so that it gets run only once. Also
flatten out heavily nested if statements to make it clearer.

* mh-e.el (mh-folder-mode): Call mh-image-load-path to allow Emacs
to find images used in the toolbar.

* mh-customize.el (:folder): Remove call to mh-image-load-path.