[IMP] web_responsive: Set viewer width to 100% to better use the space

Before this changes, when previewing a pdf there was a lot of lost space

Now, it is filling all the space

web_responsive/static/src/components/attachment_viewer/attachment_viewer.scss

@@ -37,7 +37,7 @@
                 display: none;
             }
             .o_AttachmentViewer_viewIframe {
-                width: 95%;
+                width: 100% !important;
             }
         }
     }