Always create the styles to avoid an error that prevented the height and top

being added to the inline style in Firefox.

Author: CMLL

src/gridstack.js

@@ -937,9 +937,9 @@
 
         if (typeof maxHeight == 'undefined') {
             maxHeight = this._styles._max;
-            this._initStyles();
-            this._updateContainerHeight();
         }
+        this._initStyles();
+        this._updateContainerHeight();
         if (!this.opts.cellHeight) { // The rest will be handled by CSS
             return ;
         }