Show repository size limit as MB to the user

app/views/admin/application_settings/_form.html.haml

@@ -67,7 +67,7 @@
       = f.label :repository_size_limit, class: 'control-label col-sm-2' do
         Size limit per repository (MB)
       .col-sm-10
-        = f.number_field :repository_size_limit, class: 'form-control', min: 0
+        = f.number_field :repository_size_limit, value: f.object.repository_size_limit.try(:to_mb), class: 'form-control', min: 0
         %span.help-block#repository_size_limit_help_block
           Includes LFS objects. It can be overridden per group, or per project. 0 for unlimited.
           = link_to icon('question-circle'), help_page_path("user/admin_area/settings/account_and_limit_settings")

app/views/groups/_repository_size_limit_setting.html.haml

@@ -3,6 +3,6 @@
     = f.label :repository_size_limit, class: 'control-label' do
       Repository size limit (MB)
     .col-sm-10
-      = f.number_field :repository_size_limit, class: 'form-control', min: 0
+      = f.number_field :repository_size_limit, value: f.object.repository_size_limit.try(:to_mb), class: 'form-control', min: 0
       %span.help-block#repository_size_limit_help_block
         = size_limit_message_for_group(@group)

app/views/projects/edit.html.haml

@@ -38,7 +38,7 @@
           .form-group
             = f.label :repository_size_limit, class: 'label-light' do
               Repository size limit (MB)
-            = f.number_field :repository_size_limit, class: 'form-control', min: 0
+            = f.number_field :repository_size_limit, value: f.object.repository_size_limit.try(:to_mb), class: 'form-control', min: 0
             %span.help-block#repository_size_limit_help_block
               = size_limit_message(@project)