Fix Style/EmptyCaseCondition rubocop issue

.rubocop_todo.yml

@@ -480,12 +480,6 @@ Style/DoubleNegation:
   Exclude:
     - 'app/models/flag.rb'
 
-# Offense count: 1
-# Cop supports --auto-correct.
-Style/EmptyCaseCondition:
-  Exclude:
-    - 'app/models/concerns/verification.rb'
-
 # Offense count: 2
 # Configuration parameters: ExpectMatchingDefinition, Regex, IgnoreExecutableScripts, AllowedAcronyms.
 # AllowedAcronyms: CLI, DSL, ACL, API, ASCII, CPU, CSS, DNS, EOF, GUID, HTML, HTTP, HTTPS, ID, IP, JSON, LHS, QPS, RAM, RHS, RPC, SLA, SMTP, SQL, SSH, TCP, TLS, TTL, UDP, UI, UID, UUID, URI, URL, UTF8, VM, XML, XMPP, XSRF, XSS

app/models/concerns/verification.rb

@@ -55,10 +55,9 @@ module Verification
   end
 
   def user_type
-    case
-    when level_three_verified?
+    if level_three_verified?
       :level_3_user
-    when level_two_verified?
+    elsif level_two_verified?
       :level_2_user
     else
       :level_1_user