PB-170: TinyMCE Performance is very poor with multiple instances on Stage

- Resolve image alignment in TinyMCE

Author: davemacaulay

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/slide/_default.less

@@ -134,6 +134,7 @@
             min-height: 50px;
 
             img {
+                display: inline;
                 height: auto;
             }
         }