PLT-6896 per-paging for logs (#7903)

* PLT-6896 Read logs from last

* Getting rid of file.Stats

* remove deprecated value

* Make non-reassigned value constant

api4/system.go

@@ -187,7 +187,7 @@ func getLogs(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	lines, err := c.App.GetLogs(c.Params.Page, c.Params.PerPage)
+	lines, err := c.App.GetLogs(c.Params.Page, c.Params.LogsPerPage)
 	if err != nil {
 		c.Err = err
 		return