Pass PathLeaf even if "scoped from" another expr

TODO: why does this fix it? Maybe it's being erroneously marked as
scoped-from in this case?

Author: scotttrinh

packages/generate/src/syntax/toEdgeQL.ts

@@ -397,7 +397,7 @@ function walkExprTree(
 
   const expr = _expr as SomeExpression;
 
-  if ((expr as any).__scopedFrom__ != null) {
+  if ((expr as any).__scopedFrom__ != null && expr.__kind__ !== ExpressionKind.PathLeaf) {
     // If expr is marked as being a scoped copy of another expr, treat it as
     // an opaque reference and don't walk it. The enclosing select/update that
     // owns the scope will walk the actual unscoped expr.