chore: change OU_APP_NAME to APP_NAME

Author: Abdur-rahmaanJ

pythoncms/modules/box__default/base/templates/base/nav_base.html

@@ -4,7 +4,7 @@
     <!-- Brand/logo -->
     <a class="navbar-brand" href="#">
         <img src="/static/shopyo.svg" width="35" height="30">
-        {{OUR_APP_NAME}} | {{active_page.capitalize()}}
+        {{APP_NAME}} | {{active_page.capitalize()}}
     </a>
     <!-- Nav Links Left Aligned -->
     <ul class="navbar-nav">