JS: Localize charpred of API::EntryPoint

This is needed for localizing ApiLabel later

javascript/ql/test/ApiGraphs/custom-entry-point/VerifyAssertions.ql

@@ -1,3 +1,4 @@
+overlay[local?]
 class CustomEntryPoint extends API::EntryPoint {
   CustomEntryPoint() { this = "CustomEntryPoint" }