add blockhash to header for /block-height/N pages for consistency

views/block-height.pug

@@ -6,6 +6,8 @@ block headContent
 block content
 	h1(class="h2") Block 
 		small(class="monospace") ##{blockHeight.toLocaleString()}
+		br
+		small(style="width: 100%;", class="monospace word-wrap") #{result.getblock.hash}
 	hr
 
 	include includes/block-content.pug