bug#35421: Also bind left image rotation key

[Lars Ingebrigtsen]

積丹尼 Dan Jacobson <jidanni@jidanni.org> writes:

> When viewing an image we type C-h m
>
>    Image[imagemagick] mode defined in ‘image-mode.el’:
>
> there is only one rotate command bound
>
>    r          image-rotate
>
> and it only rotates right. To rotate left one must hit it three times.

I don't think it's worth adding more keystrokes to the image map --
images can appear in any mode and it's better to keep the number of
keystrokes limited.

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   bloggy blog: http://lars.ingebrigtsen.no