fix param of recipeEvent.custom(...)

Author: ZZZank

src/main/java/zzzank/probejs/docs/ParamFix.java

@@ -43,7 +43,7 @@ public void modifyClasses(ScriptDump scriptDump, Map<ClassPath, TypeScriptFile>
                             )
                         )
                     )
-                    .literalMember("[x in string]", Types.ANY)
+                    .literalMember("[x: string]", Types.ANY)
                     .build()
                     .comment("other recipe json elements are unknown to ProbeJS :(")
             );