Fix inline edit runner-description

Replaced .show and .hide with .removeClass('hide') and .addClass('hide') (Like done for #192 in MR 177)

CHANGELOG

 v7.13.0
+  - Fix inline edit runner-description
   - Allow to specify image and services in yml that can be used with docker
   - Fix: No runner notification can see managers only
   - Ability to cancel all builds in commit at once
@@ -40,7 +41,7 @@ v7.12.0
   - Using .gitlab-ci.yml file instead of jobs
   - Link to the runner from the build page for admin user
   - Ability to set secret variables for runner
-  - Dont retry build when push same commit in same ref twice 
+  - Dont retry build when push same commit in same ref twice
   - Admin area: show amount of runners with last contact less than a minute ago
   - Fix re-adding project with the same name but different gitlab_id
   - Implementation of Lint (.gitlab-ci.yml validation tool)
@@ -84,7 +85,7 @@ v7.10.0
   - Runners sorting in admin area (by id)
   - Remove protected_attributes gem
   - Skip commit creation if there is no appropriate job
-  
+
 v7.9.3
   - Contains no changes
   - Developers can cancel and retry jobs

app/assets/javascripts/application.js.coffee

@@ -28,17 +28,17 @@ $(document).on 'click', '.edit-runner-link', (event) ->
   event.preventDefault()
   descr = $(this).closest('.runner-description').first()
-  descr.hide()
+  descr.addClass('hide')
   form = descr.next('.runner-description-form')
   descrInput = form.find('input.description')
   originalValue = descrInput.val()
-  form.show()
+  form.removeClass('hide')
   form.find('.cancel').on 'click', (event) ->
     event.preventDefault()
-    form.hide()
+    form.addClass('hide')
     descrInput.val(originalValue)
-    descr.show()
+    descr.removeClass('hide')
 $(document).on 'click', '.assign-all-runner', ->
   $(this).replaceWith('<i class="icon-refresh icon-spin"></i> Assign in progress..')