[FIX][web_responsive] Remove hidden floating input over images

Without this patch, when you clicked on a partner's name field next to its image, it asked you to change its image.

web_responsive/static/src/less/form_view.less

@@ -82,6 +82,9 @@
         display: block;
         opacity: 0.7;
     }
+    .oe_hidden_input_file {
+        display: none;
+    }
 
     // Adapt chatter widget to small viewports
     .oe_chatter {