Rename project_params in PublicProjectsController

I'm about to add an update action which needs different params, so
renaming `project_params` to `create_params` will make that change
simpler.

Author: floehopper

app/controllers/api/public_projects_controller.rb

@@ -7,7 +7,7 @@ class PublicProjectsController < ApiController
 
     def create
       authorize! :create, :public_project
-      result = PublicProject::Create.call(project_hash: project_params)
+      result = PublicProject::Create.call(project_hash: create_params)
 
       if result.success?
         @project = result[:project]
@@ -19,12 +19,12 @@ def create
 
     private
 
-    def project_params
+    def create_params
       params.require(:project).permit(:identifier, :locale, :project_type, :name)
     end
 
     def restrict_project_type
-      project_type = project_params[:project_type]
+      project_type = create_params[:project_type]
       return if project_type == Project::Types::SCRATCH
 
       raise CanCan::AccessDenied.new("#{project_type} not yet supported", :create, :public_project)