misc: fix npm badge to correct url

Author: jsm174

README.md

@@ -1,6 +1,6 @@
 # Visual Pinball Engine - Visual Scripting
 
-[![UPM Package](https://img.shields.io/npm/v/org.visualpinball.engine.pinmame?label=org.visualpinball.engine.pinmame&registry_uri=https://registry.visualpinball.org&color=%2333cf57&logo=unity&style=flat)](https://registry.visualpinball.org/-/web/detail/org.visualpinball.unity.visualscripting)
+[![UPM Package](https://img.shields.io/npm/v/org.visualpinball.unity.visualscripting?label=org.visualpinball.unity.visualscripting&registry_uri=https://registry.visualpinball.org&color=%2333cf57&logo=unity&style=flat)](https://registry.visualpinball.org/-/web/detail/org.visualpinball.unity.visualscripting)
 
 *Enables Unity Visual Scripting to drive VPE*