enable blank line linter and fix

.erb-lint.yml

@@ -11,7 +11,7 @@ linters:
   CommentSyntax:
     enabled: true
   ExtraNewline:
-    enabled: false
+    enabled: true
   FinalNewline:
     enabled: true
   NoJavascriptTagHelper:

app/views/problems/index.html.erb

@@ -4,7 +4,6 @@
 
 <%= paginate @problems %>
 
-
 <% if @problems.empty? %>
 	<div class="alert alert-info">
 		<%= t(".no_problems") %>

app/views/settings/show.html.erb

@@ -1,6 +1,5 @@
 <h1>Settings</h1>
 
-
 <%= form_with url: user_settings_path(user: @user), method: :patch do |form| %>
   <div class="row mb-4">
     <div class="col">