layouts: Migrate from _build to build in reading build options

Author: Leo3418

layouts/partials/GetDescendantPages.html

@@ -4,7 +4,7 @@
 */}}
 
 {{- $pages := slice }}
-{{- if eq (.Params._build.list | default "always") "always" }}
+{{- if eq (.Params.build.list | default "always") "always" }}
 {{- $pages = $pages | append . }}
 {{- end }}
 

layouts/partials/nav-list-hier.html

@@ -41,7 +41,7 @@
 generated list is glitchy as a result.
 */}}
 
-{{- if eq (.this.Params._build.list | default "always") "always" }}
+{{- if eq (.this.Params.build.list | default "always") "always" }}
     <li><a href="{{ .this.RelPermalink }}"
            {{- if eq .this .currentPage }} class="active"{{- end -}}>
         {{- markdownify .this.Title -}}