fix: use committer time where ever possible as default (#37969)

Fix https://github.com/go-gitea/gitea/issues/37857

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/repo/wiki.go

@@ -496,7 +496,7 @@ func Wiki(ctx *context.Context) {
 		ctx.ServerError("GetCommitByPath", err)
 		return
 	}
-	ctx.Data["Author"] = lastCommit.Author
+	ctx.Data["Committer"] = lastCommit.Committer
 
 	ctx.HTML(http.StatusOK, tplWikiView)
 }
@@ -528,7 +528,7 @@ func WikiRevision(ctx *context.Context) {
 		ctx.ServerError("GetCommitByPath", err)
 		return
 	}
-	ctx.Data["Author"] = lastCommit.Author
+	ctx.Data["Committer"] = lastCommit.Committer
 
 	ctx.HTML(http.StatusOK, tplWikiRevision)
 }
@@ -587,7 +587,7 @@ func WikiPages(ctx *context.Context) {
 			Name:         displayName,
 			SubURL:       wiki_service.WebPathToURLPath(wikiName),
 			GitEntryName: entry.Entry.Name(),
-			UpdatedUnix:  timeutil.TimeStamp(entry.Commit.Author.When.Unix()),
+			UpdatedUnix:  timeutil.TimeStamp(entry.Commit.Committer.When.Unix()),
 		})
 	}
 	ctx.Data["Pages"] = pages