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paint: restore color channel on undo after conversion thru pipe

converting image thru pipe would not properly restore the
original color channel on undo. like |iconv -c k8 would
still be grayscale after undo.

--- a/sys/src/cmd/paint.c

+++ b/sys/src/cmd/paint.c

@@ -259,10 +259,16 @@

 		if((tmp = undo[x]) == nil)

 			return;

 		undo[x] = nil;

-		expand(tmp->r);

-		draw(canvas, tmp->r, tmp, nil, tmp->r.min);

-		update(&tmp->r);

-		freeimage(tmp);

+		if(canvas != nil && canvas->chan != tmp->chan){

+			freeimage(canvas);

+			canvas = tmp;

+			update(nil);

+		} else {

+			expand(tmp->r);

+			draw(canvas, tmp->r, tmp, nil, tmp->r.min);

+			update(&tmp->r);

+			freeimage(tmp);

+		}

 	}

 }

-- 

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