[BrowserTest] rubocop change to an if()

Change-Id: I5ae9ec4d94af88fa67ac8de58a38b6ea03b14acc

.rubocop_todo.yml

@@ -36,8 +36,3 @@ Style/Documentation:
 Style/GlobalVars:
   Enabled: false
 
-# Offense count: 1
-# Configuration parameters: MaxLineLength.
-Style/IfUnlessModifier:
-  Enabled: false
-

modules/ve-mw/tests/browser/features/support/language_screenshot.rb

@@ -34,9 +34,7 @@ def crop_image(path, page_elements, offset_element)
 
   # It happens with some elements that an image goes off the screen a bit,
   # and chunky_png fails when this happens
-  if image.width < top_left_x + width
-    width = image.width - top_left_x
-  end
+  width = image.width - top_left_x if image.width < top_left_x + width
 
   image.crop!(top_left_x, top_left_y, width, height)
   image.save path