Rename variable to `public_project_count`

app/views/dashboard/projects/_blank_state_welcome.html.haml

-- publicish_project_count = ProjectsFinder.new(current_user: current_user).execute.count
+- public_project_count = ProjectsFinder.new(current_user: current_user).execute.count
 
 - if current_user.can_create_group?
   .blank-state.clearfix
@@ -31,7 +31,7 @@
       = link_to new_project_path, class: "btn btn-new" do
         New project
 
-- if publicish_project_count > 0
+- if public_project_count > 0
   .blank-state.clearfix
     .col-md-1.col-md-offset-3.blank-state-icon
       = custom_icon("globe", size: 50)
@@ -40,7 +40,7 @@
         Explore public projects
       %p.blank-state-text
         There are
-        = number_with_delimiter(publicish_project_count)
+        = number_with_delimiter(public_project_count)
         public projects on this server.
         Public projects are an easy way to allow
         everyone to have read-only access.