Fixed Style/TrailingBlankLines RuboCop offense

Change-Id: I7cbfd6d148982039c720fc4fb72e410372a0cbde
See: https://github.com/bbatsov/ruby-style-guide#newline-eof
Bug: T117984

.rubocop_todo.yml

@@ -23,16 +23,6 @@ Style/GlobalVars:
 Style/StringLiterals:
   Enabled: false
 
-# Offense count: 4
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, SupportedStyles.
-Style/TrailingBlankLines:
-  Exclude:
-    - 'tests/browser/features/step_definitions/mmv_download_steps.rb'
-    - 'tests/browser/features/step_definitions/mmv_navigation_steps.rb'
-    - 'tests/browser/features/step_definitions/mmv_options_steps.rb'
-    - 'tests/browser/features/step_definitions/mmv_performance_steps.rb'
-
 # Offense count: 3
 # Configuration parameters: EnforcedStyle, SupportedStyles.
 Style/VariableName:

tests/browser/features/step_definitions/mmv_navigation_steps.rb

@@ -41,4 +41,4 @@ Then /^I should be navigated back to the original wiki article$/ do
     expect(page.image1_in_article_element).to be_visible
     expect(page.mmv_wrapper_element).not_to be_visible
   end
-end
+end

tests/browser/features/step_definitions/mmv_performance_steps.rb

@@ -46,4 +46,3 @@ Then /^the MMV image is loaded in (\d+) percent of the time with a (.*) cache an
     expect(mmv_time).to be < expected_time
   end
 end
-