fix dragging style

Signed-off-by: ryjiang <jiangruiyi@gmail.com>

client/src/pages/databases/Databases.tsx

@@ -111,6 +111,7 @@ const Databases = () => {
 
         // set tree width
         setUIPref({ tree: { width: treeWidth } });
+        setIsDragging(true);
       });
     };