tpl: Remove RSS deprecation site.Author check

The check itself creates a warning which I guess was not intended.

We could possibly make that work, but it has been deprecated since Hugo 0.98, so just remove the usage.

Author: bep

tpl/tplimpl/embedded/templates/_default/rss.xml

@@ -1,19 +1,12 @@
-{{- /* Deprecate site.Author.email in favor of site.Params.author.email */}}
 {{- $authorEmail := "" }}
 {{- with site.Params.author }}
   {{- if reflect.IsMap . }}
     {{- with .email }}
       {{- $authorEmail = . }}
     {{- end }}
   {{- end }}
-{{- else }}
-  {{- with site.Author.email }}
-    {{- $authorEmail = . }}
-    {{- warnf "The author key in site configuration is deprecated. Use params.author.email instead." }}
-  {{- end }}
 {{- end }}
 
-{{- /* Deprecate site.Author.name in favor of site.Params.author.name */}}
 {{- $authorName := "" }}
 {{- with site.Params.author }}
   {{- if reflect.IsMap . }}
@@ -23,11 +16,6 @@
   {{- else }}
     {{- $authorName  = . }}
   {{- end }}
-{{- else }}
-  {{- with site.Author.name }}
-    {{- $authorName = . }}
-    {{- warnf "The author key in site configuration is deprecated. Use params.author.name instead." }}
-  {{- end }}
 {{- end }}
 
 {{- $pctx := . }}