Prefer leading dots over trailing dots

Feedback:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7237#note_20601323

app/controllers/projects/compare_controller.rb

@@ -37,8 +37,8 @@ class Projects::CompareController < Projects::ApplicationController
   end
 
   def define_diff_vars
-    @compare = CompareService.new(@project, @head_ref).
-      execute(@project, @start_ref)
+    @compare = CompareService.new(@project, @head_ref)
+      .execute(@project, @start_ref)
 
     if @compare
       @commits = @compare.commits