Remove unused 'best color' algorithm.

This code is used to efficiently determine the most saturated colour in an image,
Kabuki uses this as the highlight colour on a page, but this styling has always
been disabled in HashRU Pics. Hence, we can safely remove the code, freeing up
some CPU cycles in the process. ;-)

templates/AlbumIndex.php

@@ -35,12 +35,8 @@ class AlbumIndex extends SubTemplate
 
 			foreach ($photos as $album)
 			{
-				$color = isset($album['thumbnail']) ? $album['thumbnail']->bestColor() : 'ccc';
-				if ($color == 'FFFFFF')
-					$color = 'ccc';
-
 				echo '
-						<div class="landscape" style="border-color: #', $color, '">';
+						<div class="landscape">';
 
 				if ($this->show_edit_buttons)
 					echo '

templates/PhotosIndex.php

@@ -80,19 +80,10 @@ class PhotosIndex extends SubTemplate
 		$this->previous_header = $header;
 	}
 
-	protected function color(Image $image)
-	{
-		$color = $image->bestColor();
-		if ($color == 'FFFFFF')
-			$color = 'ccc';
-
-		return $color;
-	}
-
 	protected function photo(Image $image, $className, $width, $height, $crop = true, $fit = true)
 	{
 		echo '
-				<div class="', $className, '" style="border-color: #', $this->color($image), '">';
+				<div class="', $className, '">';
 
 		if ($this->show_edit_buttons)
 			echo '