[FIX] project: fix display of rating page for projects

Display was ugly and using only a small part of the screen. Let us use the
whole available space.

This commit is linked to task ID 1880739.

addons/project/views/project_rating_templates.xml

@@ -153,7 +153,7 @@
                     <div class="container o_project o_portal_project_rating">
                         <h1 t-esc="project.name" class="text-center"/>
                         <div class="row mb32">
-                            <div>
+                            <div class="col-lg-12">
                                 <h3 class="o_page_header">Customer Ratings</h3>
                                 <div class="row">
                                     <div class="col-lg-7">