Normalize vocabulary roots by removing the last path separator so that scaffold tool works with trailing separators

basis/tools/scaffold/scaffold.factor

@@ -22,7 +22,9 @@ M: bad-developer-name summary
 
 <PRIVATE
 
-: vocab-root? ( string -- ? ) vocab-roots get member? ;
+: vocab-root? ( string -- ? )
+    trim-tail-separators
+    vocab-roots get member? ;
 
 : contains-dot? ( string -- ? ) ".." swap subseq? ;
 

core/vocabs/loader/loader.factor

@@ -22,6 +22,7 @@ SYMBOL: add-vocab-root-hook
 ] "vocabs.loader" add-startup-hook
 
 : add-vocab-root ( root -- )
+    trim-tail-separators
     [ vocab-roots get adjoin ]
     [ add-vocab-root-hook get-global call( root -- ) ] bi ;