Rubocop fixes

Author: rsmithlal

spec/mailers/previews/better_together/platform_invitation_mailer_preview.rb

@@ -11,7 +11,7 @@ class PlatformInvitationMailerPreview < ActionMailer::Preview
     def invite
       platform = host_platform || create(:platform)
       platform_invitation = create(:platform_invitation,
-                                  invitable: platform)
+                                   invitable: platform)
 
       BetterTogether::PlatformInvitationMailer.with(platform_invitation:).invite(platform_invitation)
     end