[11] Backport web_responsive fix #873 to v11 (#1089)

* Backport fix to web_responsive

See more at: 93a3bf5a1a

* Update version

* Follow comments.

* Clean as suggested.

web_responsive/static/src/less/main.less

@@ -46,6 +46,15 @@ main {
 }
 
 .o_web_client {
+    &.o_fullscreen {
+        #oe_main_menu_navbar,
+        .o_main .o_sub_menu,
+        .navbar,
+        .main-nav{
+            display: none
+        }
+    }
+
     >.o_main {
         overflow: auto;
         > .o_main_content {