Fix order of parameters passed in the NamingUtil (#1455)

Author: netomi

server/src/main/java/org/eclipse/openvsx/cache/ExtensionJsonCacheKeyGenerator.java

@@ -26,6 +26,6 @@ public Object generate(Object target, Method method, Object... params) {
     }
 
     public String generate(String namespaceName, String extensionName, String targetPlatform, String version) {
-        return NamingUtil.toFileFormat(namespaceName, extensionName, version, targetPlatform);
+        return NamingUtil.toFileFormat(namespaceName, extensionName, targetPlatform, version);
     }
 }