limit datasource name to 16ch

Author: Imiss-U1025

client/packages/lowcoder/src/pages/editor/bottom/BottomTabs.tsx

@@ -266,7 +266,7 @@ export function BottomTabs<T extends TabsConfigType>(props: {
             </React.Fragment>
           ))}
 
-        <div style={{ margin: "auto" }}>
+        <div style={{ margin: "auto", width: 0, flexGrow: 1, minWidth: '16ch' }}>
           <EditText
             disabled={readOnly}
             text={tabTitle}